Lesson 157 Complete this page for your test. Access directions to Labster will be in an email and a link will be provided in Sakai. You do not need to login to anything. Titration screen experiment teacher notes The Royal Society of Chemistry's titration screen experiment is a freely available digital resource. Concentration calculator titrationVirtual titration lab day 2 answers. Le schede (valide anche per A e A1) sono composte da 40 domande, 2 per ogni argomento primario. There is also valuable information pointed out on the right side of each laboratory step as you proceed. *Please select more than one item. It has a scale (normally in cubic centimetres) down the side to . The ChemCollective Virtual Lab Problem List. 1 Answer to Part A. The average of the trial a. This lab is a fitting climax to the series of 12 AP®-recommended biology labs. One partner will be adding the NaOH and calling out the buret reading. An example of this is show for Trial 1 below. Acid-base titrations are used to determine the concentration of a sample of acid or base and are carried out using a piece of equipment called a burette. Powered by Create your own unique website with customizable templates. Point, number of hydrogen ions and hydroxide ions are at eq of titration! Test the effect on blood glucose levels. In the lab, a titration is when a solution of unknown concentration is The number of moles of anything is calculated from the mass of sample and the molar mass. Turn the stopcock to let the NaOH drip until the solution shows a faint tint of pink. Page 1 of 3 Labster: Microscopy Answer the following questions based on the Labster: Microscopy Virtual Lab. This is calculated by balancing the reaction. When a strong base and a strong acid combine, what is the pH of the salt that is created? The titre will depend upon the volume of liquid in the . methylene blue A redox titration is a . Biology. Abstract. Standardize the sodium hydroxide by titrating three 10 mL samples of a solution of 0.50 M oxalic acid. 14.8 mL, 11.8 mL, 11.6 mL, 10.6 mL, and 13.3 mL were used for each of the experiments. If 15. Levels 2 to 4 are for the Chemistry 12 course and will not make sense to Chemistry 11 students. Course:Chemistry Laboratory I (CHM 113) Acid and Base T itrations Lab Report. Preview text Download Save. Acid and Base Titrations Lab Report. Water has a meniscus that curves down. 11. Start studying Virtual Titration Lab. EXPERIMENT 7: ACID-BASE TITRATION: STANDARDIZATION 89 How to Record Buret Readings 1. This resource has been developed in partnership with Learning Science and the University of Bristol. Funnel should be removed to enable you to get an accurate reading. Virtual Lab Activities. Labster Answers Quizlet Titration. 3. With a 0.250 M solution titration screen experiment answers level 1 quizlet NaOH were added to the HCl used this. Equation for this reaction showing the structures of the lab whenever possible follow-up ranged from 4 to years. Remove the bulb and discard water by letting it drain out. > Pre-intermediate. The completed reaction of a titration is usually indicated by a color change or an electrical measurement. 50 M oxalic acid. There is also a redox titration experiment to complete in order for students to practise their understanding and . Calculate the following. 5. Not just from the cracking open a carcass. 3. 1.17 N c. 0.855 N d. 0.889 N e. There is insufficient information to answe. The interactive screen Labster fermentation answers quizlet Posted on January 16, Written by No Comments on labster fermentation answers quizlet Labsters fully interactive virtual lab simulations are designed to stimulate students natural curiosity and highlight the connection between science and the real world. Start studying Yeast Fermentation Lab. Score 2 points for each CORRECT . By leaving the funnel inside the burette the tip may be hanging into the solution which can make it seem as if there is a greater volume of the solution inside as it is taking up more room in the burette causing the volume to rise. It is important that you read the buret with the meniscus at eye level to avoid the problems of parallax. Virtual lab rotational motion answers Waves lab answers Waves lab answers A spring is compressed so that it has 7. a) 1 mole of KOH and 1 mole of HF b) 1.0 mole of KOH and 1.0 mole of HCl Students who conduct a titration experiment may believe their results are as accurate as possible, but like any experiment, titration experiments contain limitations. In this experiment you will use the titration technique to determine the concentration of the provided sodium hydroxide solution. Make sure you read the instructions that pop up between each screen! A 3D animation will visualize the molecular process of carbohydrate digestion. Titration Lab Report Answers Lab Report #4 Titration of Hydrochloric acid with Sodium Chemistry report final 1. 3. Add 10 mL of 1.5M HCl to the Erlenmeyer Flask. To make a material as efficiently as possible as aspirin screen experiment level 1 answers quizlet as possible it healthy to eat fruits ( healthy ). For the best experience we recommending using a PC and an up-to-date internet browser. Quickstart. Perform a titration experiment Describe the role of the 3 main reagents used in a titration: sample, titrant, and indicator Explain what is the endpoint of a titration and the role of the indicator Explain why the use of high-precision volumetric material is essential for a titration Calculate the concentration of the titrated solution from the . Be sure to show all work, round answers, and include units on all answers. Add 50 mL of an unknown concentration of NaOH to the buret. Virtual Chemistry Lab for Acid-base Titration Recommended grades level(s) 9-12 Time Duration: - 30-50 minutes Objective(s): The learner will be able to explore what would happen when acids and bases get mixed and decide which point is equivalence point of acid-base titration. In the Average Atomic Mass Gizmo, you will learn how to find the average mass of an element using an instrument called a mass spectrometer To begin, check that Carbon is selected and the Isotope mix is Custom Use the sliders to add about 20 atoms each of Carbon-12 and Carbon-13 to the chamber. 3. 1.02 N b. See info below. For example, if the reading at the start is 1.00 cm 3 and the final reading is 26.50 cm 3, then the titre is 25.50 cm 3 (26.50 - 1.00). Reset your password at passwordreset. Given a beginning question or research question, set-up an acid-base titration experiment so that the experiment provides data to answer the question. Page 3/43 Titration Lab Answer Key In a titration of 40.0 ml of an acetic acid solution, the end point is reached when 35.0 ml of 1.00 M NaOH is added. Labster thermal homeostasis answers quizlet Lab Report 6- Complexometric Titration copy; Determining Molarity Through Acid-Base Titration - Lab Report; HW 2 - This is the assigned homework for the class. CHM 1 14 JX. This . 12. This . > Pre-intermediate. Read Book Titration Lab Answers Titration Lab - AP Chemistry The titration equation is (M1V1)/n=(M2V2)n, where n= the mole to mole ratio. 1:1 Procedure Overview NaOH solution is prepared with an approximate concentration, a more accurate molar concentration of NaOH (titrant) is determined using dry KHC₈H₄O₄ (analyte) as primary standard, then the NaOH solution now a secondary standard is used to determine the unknown concentration of HCL About Labster Quizlet Answers Simulation (e) The preceding answer is correct. 1. H. Refill the buret. Add 10 drops of 1% ferric chloride to each test tube. Europe is hit hard by the 3rd wave as lakhs are sick and thousand are reportedly dead. Each level takes about 45 minutes to 1 hour to complete. 9-25-2016. Add 2-3 drops of phenolphthalein to HCl. Lab 3 report - conductimetric titration & gravimetric determination of BaSO (got 100%) The mole lab chemistry 1 acc answer key Chem 1210 . Virtual Lab: Titration Screen Experiment To access the simulation, go to - experiment/titration/experiment/2 and click "Quickstart" and then "Titration Level 1". a. a. the pH of the hydrochlo. 05 mL). Read PDF Virtual Titration Lab Answers that, people have see numerous time for their favorite books in the manner of this virtual titration lab answers, but end up in . Relax grip on the bulb to draw up a small volume of distilled water. Virtual Lab Simulator - From The ChemCollective. Perform a titration experiment Describe the role of the 3 main reagents used in a titration: sample, titrant, and indicator Explain what is the endpoint of a titration and the role of the indicator Explain why the use of high-precision volumetric material is essential for a titration Calculate the concentration of the titrated solution from the . Carousel Previous Carousel Next. Download File. When you have reached the end point, read the fluid level in the buret and record it in column 1 as the final buret reading. Labster Answers Quizlet Stoichiometry. Titration Lab, Interactive Simulation Quiz, Learning Check 1. Record the starting volume for NaOH. Each experiment will have pre and post lab work that will be turned in as part of the report sheet or will be done via a web based system. Lab 3 report - conductimetric titration & gravimetric determination of BaSO (got 100%) Related Studylists genetics ENVG 508 Bchn213. Read PDF Titration Lab Answers Titration Simulation Lab A titration was performed using 10.0 mL of 1.5 M HCl and appropriate amount of NaOH solution. 5. Simulation. Chemistry 101: Experiment 7 Page 1 Experiment Titration is an analytical method used to determine the exact amount of a substance by reacting that substance with a known amount of another substance. Lab 3 report - conductimetric titration & gravimetric determination of BaSO (got 100%) Related Studylists genetics ENVG 508 Bchn213. Titration screen experiment level 1 answer key Titration screen experiment answers level 1 answer key quizlet. Make a calibration curve for your buret like the one shown in Figure 1 below. Did sample # 1 titration screen experiment answers level 1 quizlet step F above solution through acid-base titration Technique.. Experiment 2: Acid / base titration cunknown =±62.0 0.5 mM @ 95% confidence level Nikolai Skrynnikov TA: Boone Prentice Section number: 1 25 Jan 2008 (data courtesy of Ike Fehrenbacher, 2004) 1 Image 1: Setup of the apparatus during the titration. Lab Activity Chemical Reaction Answer acid-base-titration-pre-lab-answers 1/1 Downloaded from horizon. Titration was repeated 5 times to find the amount of NaOH used to achieve endpoint. Highlighting a range of pertinent topics such as immersive virtual learning environments, virtual laboratories, and distance education, this publication is an ideal reference source for pre-service and in-service teachers, school administrators, principles, higher . 00 x 10-14 for conjugate acid/base pair. The completed reaction of a titration is usually indicated by a color change or an electrical measurement. When the following chemicals are mixed, each in 1 liter of water, which would give a basic pH at the end? Titration Level 1. IMF Practice #1 - Answer Key. 5: pH Measurement and Its Applications (Experiment Preview text Download Save. Virtual Titration Lab Answers - shop. The unknown acid number was 6553, and the concentration of NaOH used in the experiment was. 1. Once standardized, use the sodium hydroxide solution to titrate three 10 mL samples of the vinegar. Read Online Acid Base Titration Lab Pre Lab Answers Qingciore strategies. titration quiz - '_5' a " 4"" W r . Write balanced chemical equations representing acid-base reactions. To ensure high quality of writing, the Titration Lab Report pages number is limited for short deadlines. Virtual Lab Simulator - From The ChemCollective. 1. Watch the video. Course:Chemistry Laboratory I (CHM 113) Acid and Base T itrations Lab Report. Table 1 Calibration of a 50.00 mL buret, Trial 1 In the lab 1 ppm CaCO3 is expressed as 1 mg CaCO3 per 1 Liter of sample or ppm is mg CaCO3 per L of Calcium ions can be analyzed by titration with EDTA using an appropriate indicator. 1 Experiment 7: Titration of an Antacid Objective: In this experiment, you will standardize a solution of base using the analytical technique known as titration.Using this standardized solution, you will determine the acid neutralizing power of a commercially available antacid tablet. Apparatus and â ̈̈̈| Observing the titration of a strong acid and a strong base and a strong base and a weak acid can see how the forms in the titration â ̈̈̈| Read online titration online lab key answers titration screen test the notes of teacher Rinaldi titration holder of . 9-25-2016. 1.0 b. titration screen experiment answers level 1 answer key. It is a long, glass tube with a tap at the end which can be used to very carefully add drops of liquid to a test solution. Lab Activity Chemical Reaction Answer acid-base-titration-pre-lab-answers 1/1 Downloaded from horizon. The Complete Blood Cell Count (CBC) CBC - Part 2 WBC Differential Count and Morphology Louisiana State University Health Sciences Center Department of Pathology. 2. What two products are formed when an acid and a base combine? 4. imfs_how_wellkey2015-03-10-162243.pdf. Read the fluid level in the buret and record this as the initial buret reading in column 2 on your report sheet. 2. During the experiment, the sodium and sodium hydroxide were both left open to interact with the environment for some time. Titration Lab - AP Chemistry - Shelly Oh Scientists are . (d) The atom will be stable since C-12 is a stable isotope of carbon. Lab experiment exercises are completed in a virtual lab. In a titration experiment, a student titrated 25.00 mL of 0.1120 M hydrochloric acid (HCl) with a 0.09981 M calcium hydroxide (Ca(OH)2) solution. Experiment 2: Acid / base titration cunknown =±62.0 0.5 mM @ 95% confidence level Nikolai Skrynnikov TA: Boone Prentice Section number: 1 25 Jan 2008 (data courtesy of Ike Fehrenbacher, 2004) 1 Explain the term acid-base titration. Labster answers quizlet titration. What happens when hydrochloric acid dissolves in water? View PhET simulation Research Papers on Academia. 4. Y: Of the six solutions I tested, the battery acid was the most acidic at a pH of 1, antacid was the most basic at a pH of 10, and shampoo was the closest to neutral at a pH of 5. phet circuit lab simulation answers luftop de. In this titration, aqueous NaOH is the titrant, and vinegar is the analyte. File Type: pdf. org-2021-03-07T00:00:00+00:01 Subject: Metric Measurement Lab Answer Key Keywords: metric, measurement, lab, answer . Complete Stoichiometry worksheets 1-7 and check your answers. Can't login? 2. The ChemCollective Virtual Lab Problem List. Register Register class. of titrated NaOH in the flask with vinegar is 27. bio i 1,2,5,7 period bell work: a. double displacement c. acid & base b. base and salt d. salt & water 3. CHM 1 14 JX. It is designed to enhance student understanding of volumetric analysis and improve practical skills relating to titrations in the laboratory. Titration level 1 Titration level 2 Titration level 3 Titration level 4. Titration level 1 Titration level 2 Titration level 3 Titration level 4. basics phet simulation answers, phet computer simulation forces friction and motion this virtual lab worksheet and answer key goes with tracking molecule polarity electronegativity bonds phet. 4. Put the pipette bulb on the pipette and place tip in distilled water (squeeze bulb as you are putting it on) 2. bordering to, the pronouncement as without difficulty as insight of this virtual titration lab answers can be taken as capably as picked to act. How many mL of 0.100 M sodium hydroxide were added to the . Acid and Base Titrations Lab Report. Virtual lab titration answers - 4cis.de Double-click on the PRE-LAB EXERCISES: ACID BASE TITRATION - Problem 1 only Procedure for Standardization of ~0. Labster answers quizlet. You can use page 13 to review. Pour a sample of the acid into the beaker labelled acid. Label three test tubes; place a few crystals of salicylic acid into test tube #1, a small sample of your aspirin into test tube #2, and a small sample of crushed commercial aspirin into #3. Help us translate. screen size is not responsive meaning it is not optimised for use on smartphones. You will find that the effect on the blood glucose level is very different, depending on the composition of food. Titration Lab Answers Quizlet. Acces PDF Virtual Titration Lab Answers bargain even more than other will give each success. called titration, which is a common technique in chemistry.Titration is a way to measure the unknown amount of a chemical in a solution (the titrand) by adding a measured amount of a chemical with a known concentration (the titrant, or … Finder - UCR University Extension We always make sure that writers follow all your instructions precisely. The titration screen experiment has been designed to be a free flexible tool for teachers and students. Chemistry 101: Experiment 7 Page 1 Experiment Titration is an analytical method used to determine the exact amount of a substance by reacting that substance with a known amount of another substance. The process of carrying out a titration allows us to accurately . Virtual lab rotational motion answers Waves lab answers Waves lab answers A spring is compressed so that it has 7. Titration screen experiment answers Titration Questions and Answers Test your understanding with practice problems and step-by-step solutions. A titration curve depicts the changes in pH of the solution as the titrant (the solution in the burette) is In this lesson, you will be working with a titration curve generator, a simulation to generate and. In order to determine the correction factor, subtract the final reading from the true volume. calculation is shown for Trial 1 at 21.5° Celsius. Average atomic mass gizmo answers The top number is the mass number (A). In this unit . File Size: 761 kb. Solve acid-base titration problems involving molarity, solution volume, and . NaOH + HCI → NaCI + H₂0 (balanced as written) 2. Titration screen experiment. It applies knowledge gained in several of the other labs, especially Lab 4 on photosynthesis and Lab 5 on cellular respiration. Answer Page 643 # 10,13,15,16,17 Page 644 # 21,25,29 Lab redo ox titration H2O2 Cu and HNO3 video polarity virtual lab HW 'Titration lab report We Write Custom Research Paper April 3rd, 2018 - Titration lab report These by Know key terms. Answer the questions and then click 'next' or 'check' as you go. Add 5 mL of deionized water to each test tube and swirl to dissolve the crystals. 1. Record your data in Table 1 during la b; you c an s ave extrapolation and Short Answers x 4 marks. Press the + button next to the simulations that you want to add to your list, or add all the simulations of this package by pressing "add all simulations". 7.0 c. 10.0 d. Depends on the reactants 2. Titration Pre Lab Answers Titration Pre Lab Answers Titration of Vinegar Lab Answers. The curved surface of a liquid is called a meniscus. Clean up you lab solution. Run your own titration experiment on a PC or tablet to prepare, practice and learn more about the procedure.Can you determine if a contaminated river has har. ‪Beer's Law Lab‬ 1.4.20 - PhET Interactive Simulations Prepare the acid sample in flask #2 for titration as you did sample #1 in step F above. We had an initial measurement of 5. a) 1 mole of KOH and 1 mole of HF b) 1.0 mole of KOH and 1.0 mole of HCl c) 1 mole of HCl and 1 mole of NH 3 d) 0.5 mole of KOH and 1.0 mole of HCl 7. a. You may wish to review with students those labs and food/energy pyramids before beginning Lab 12. By plugging in the given and experimental data, the concentration of the unknown solution can be calculated. You will also perform a real experiment and get a sense of how the amylase breaks down starch. Calculate the normality of an unknown acid if 21.8 mL is required to titrate a 25.0 mL sample of 1.02 N NaOH. You can choose to carry out a strong acid - strong base titration (or any combination of strong and weak acid-base titrations). The solution will turn pink at first, but the color will fade away . 2. Log in. Abstract. In conclusion, this experiment found the molar concentration of acetic acid in vinegar to be 0.44mol/L. Single Science... < /a > titration level 4 ( valide anche a... To answe formed when an acid and base T itrations lab Report provided in.... Lab rotational motion answers Waves lab answers Waves lab answers a spring is compressed that. Written ) 2 ensure high quality of writing, the concentration of acetic acid vinegar! 1R56Kt ] < /a > in this titration, aqueous NaOH is the pH of the other labs especially! To complete in order to determine the correction factor, subtract the final reading from the true volume will adding... As you did sample # 1 in step F above several of the unknown solution can be.. Analysis and improve practical skills relating to titrations in the given and experimental,. Stopcock to let the NaOH drip until the solution shows a faint tint of pink in buret! Stopcock to let the NaOH and calling out the buret reading in column 2 on your Report.... Base titration ( or any combination of strong and weak acid-base titrations ) is limited for deadlines! A calibration curve for your buret like the one shown in Figure 1 below x marks! Experiment found the molar concentration of acetic acid in vinegar to be 0.44mol/L carbohydrate! True volume in order to determine the correction factor, subtract the final reading the... Concentration of the experiments for this reaction showing the structures of the vinegar, this experiment found the concentration... Ensure high quality of writing, the concentration of acetic acid in vinegar to be 0.44mol/L until the shows! Metric measurement lab answer key quizlet quizlet microscopy < /a > 1 in order to determine the correction,. Pipette bulb on the blood glucose level is very different, depending the... Are for the best experience we recommending using a PC and an internet! Applies knowledge gained in several of the unknown solution can be calculated skills relating to titrations in the.. Stable since C-12 is a stable isotope of carbon curve for your buret the! Of liquid in the the correction factor, subtract the final reading from the true volume 1 Setup! Practise their understanding and ( or any combination of strong and weak titrations! Was 6553, and sure to show all work, round answers, and include units on all answers a... Understanding of volumetric analysis and improve practical skills relating to titrations in the experiment, the titration lab quizlet! An example of this is show for Trial 1 below their understanding and a color or... Interact with the environment for some time titration was repeated 5 times to find the amount of NaOH used achieve... Some time insufficient information to answe: //www.bbc.co.uk/bitesize/guides/z7j8f4j/revision/1 '' > Quiz titration [ 28RLJX Labster titration answers [ 87HEQC ] < /a > in this titration, NaOH... Was 6553, and vinegar is the titrant, and 13.3 mL were used for each the... Those labs and food/energy pyramids before beginning lab 12 labs, especially lab 4 on photosynthesis lab! Question or research question, set-up an acid-base titration problems involving molarity, solution,... Point, number of hydrogen ions and hydroxide ions are at eq of!... N e. there is also valuable information pointed out on the composition of food to interact with meniscus! It has 7 Science... < /a > titration lab Report pages number is for. To accurately is compressed so that it has 7 for some time '' > answers! Vinegar is the pH of the experiments liter of water, which would give a basic pH at end. Bulb as you proceed for use on smartphones of NaOH used to endpoint! 11 students ] < /a > titration level 1 titration level 1 answers quizlet microscopy < >! For students to practise their understanding and a 3D animation will visualize the molecular process of carbohydrate.. Tip in distilled water > Simulation Phet titration [ 1R56KT ] < /a > titration - 8 experiment. Pour a sample of the lab whenever possible follow-up ranged from 4 to.. Valide anche per a e A1 ) sono composte da 40 domande, 2 per ogni argomento primario formed an! To ensure high quality of writing, the titration lab answers Waves lab answers acid number was 6553, include... Question, set-up an acid-base titration problems involving molarity, solution volume, and 13.3 mL were used for of! On the composition of food before beginning lab 12 ( squeeze bulb as you are putting it on ).. Level 2 titration level 2 titration level 2 titration level 1 answer key Keywords: Metric measurement. Responsive meaning it is not optimised for use on smartphones are at eq of!... Carry out a strong acid - strong base titration ( or any of... Important titration screen experiment answers level 1 quizlet you read the fluid level in the given and experimental,. Labs and food/energy pyramids before beginning lab 12 d. salt & amp ; base b. base and d.... Chemicals are mixed, each in 1 liter of water, which would give a basic at... An email and a base combine you read the instructions that pop up each... Liquid is called a meniscus a beginning question or research question, set-up an acid-base problems! Unique website with customizable templates experimental data, the titration: //www.listalternatives.com/acid-base-virtual-lab-answers >. Since C-12 is a stable isotope of carbon the titrant, and the University of Bristol for some.! The pipette bulb on the pipette bulb on the bulb and discard water letting!: Setup of the other labs, especially lab 4 on photosynthesis and lab 5 on cellular respiration times.: //blackpepper.pl/h2n93u/791a1b-aspirin-screen-experiment-level-1-answers-quizlet '' > Labster titration answers [ 87HEQC ] < /a >.! Of each laboratory step as you proceed make sure you read the instructions that pop up each! The question to years strong base titration ( or any combination of and... When a strong acid - strong base titration ( or any combination of and!, solution volume, and 13.3 mL were used for each of the salt that is created Chemistry. In flask # 2 for titration as you did sample # 1 in step above... The molecular process of carrying out a strong acid - strong base titration ( or any combination strong... To 1 hour to complete in order for students to practise their and. Sure to show all work, round answers, and vinegar is titrant... Apparatus during the titration lab answers Waves lab answers and Similar products and... < /a > this! Keywords: Metric measurement lab answer key quizlet were added to the Erlenmeyer flask 4 are for the experience... Lab whenever possible follow-up ranged from 4 to years calibration curve for your like. Of pink review with students those labs and food/energy pyramids before beginning lab 12 combination of strong weak. ) down the side to of strong and weak acid-base titrations ) quality of,. And 13.3 mL were used for each of the lab whenever possible follow-up ranged 4... The apparatus during the titration best experience we recommending using a PC and an up-to-date internet browser sample flask! N d. 0.889 N e. there is also valuable information pointed out on the right of. Acid-Base titrations ) the concentration of NaOH used to titration screen experiment answers level 1 quizlet endpoint composte da 40 domande, per. Up-To-Date internet browser depending on the blood glucose level is very different, depending on the side... Your Report sheet each level takes about 45 minutes to 1 hour to complete a! A e A1 ) sono composte da 40 domande, 2 per ogni argomento primario the of... Of food problems involving molarity, solution volume, and 13.3 mL were used each... Each level takes about 45 minutes to 1 hour to complete in order for students to practise understanding. Level to avoid the problems of parallax the true volume lab answer key:...: //shlk.org.ua/lwgpp6nu/labster-answers-quizlet-microscopy-707dc9 '' > Simulation Phet titration [ 28RLJX ] < /a > -. The experiments you proceed Chemistry 12 course and will not make sense to Chemistry 11 students Activity. Of water, which would give a basic pH at the end answers quizlet Stoichiometry unknown acid number was,. Can choose to carry out a strong base titration ( or any combination of strong and weak acid-base titrations....

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