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What is the color change in this titration?

What is the color change in this titration?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1. What is the color change in this titration? 2. What is the name of the reaction between an acid and a base? 3. Name the acid and base used in the titration. 4. Calculate the molecular mass of NaNO3.
Fundamentals of Chemistry (Laboratory) Experiment No: 5 The given solution contains 7g of NaOH and NaNO3 dissolved per liter. Determine the amount/liter of each component in the mixture using 0.1M HNO3 solution Introduction In this experiment a solution having a mixture of NAOH and NaNO3 is titrated against 0.1M HNO; solution using phenolphthalein as indicator. The NaOH present in the mixture reacts with HNO; to form NANO3 and H2O. The reaction between NaOH and HNO3 is represented by Equation 1. NaOH + HN03 - NANO3 + H20 · (1) In this experiment, the students will use a pipette to transfer a known volume of solution containing mixture of NaOH and NaNO3 (unknown concentration) into the conical flask. The burette is filled the HNO3 solution (known concentration). The indicator used in the experiment is phenolphthalein which is pink in solutions of bases and colorless in solutions of acid. Hence the color of the solution changes from pink to colorless at the end point of the titration. The amount of NaOH is calculated first. The amount of NaNO3 is determined by subtracting the amount of NaOH from the total amount of NaOH and NaNO3 in the mixture.
Transcribed Image Text:Fundamentals of Chemistry (Laboratory) Experiment No: 5 The given solution contains 7g of NaOH and NaNO3 dissolved per liter. Determine the amount/liter of each component in the mixture using 0.1M HNO3 solution Introduction In this experiment a solution having a mixture of NAOH and NaNO3 is titrated against 0.1M HNO; solution using phenolphthalein as indicator. The NaOH present in the mixture reacts with HNO; to form NANO3 and H2O. The reaction between NaOH and HNO3 is represented by Equation 1. NaOH + HN03 - NANO3 + H20 · (1) In this experiment, the students will use a pipette to transfer a known volume of solution containing mixture of NaOH and NaNO3 (unknown concentration) into the conical flask. The burette is filled the HNO3 solution (known concentration). The indicator used in the experiment is phenolphthalein which is pink in solutions of bases and colorless in solutions of acid. Hence the color of the solution changes from pink to colorless at the end point of the titration. The amount of NaOH is calculated first. The amount of NaNO3 is determined by subtracting the amount of NaOH from the total amount of NaOH and NaNO3 in the mixture.
Procedure (Steps to do the experiment) 1. Add 10 ml of the solution containing NaOH and NaNO, to a conical flask using a pipette and add a 2-3 drops of phenolphthalein indicator. The solution turns pink in color. 2. Fill the burette with the acid (HNO3) upto the zero mark (use a beaker to collect the excess acid). 3. Add HN03 to the solution in the conical flask in small volumes swirling after each addition. Continue until the pink color of the solution turns colorless and record this reading of the burette. 5. Measure the volume of the acid used. 6. Repeat the same procedure for second and third time. H2SO, solution stand burette meniscus top conical (N2OH + NANO,) solution white tile / stirrer Figure 1. Titration setup for experiment 5
Transcribed Image Text:Procedure (Steps to do the experiment) 1. Add 10 ml of the solution containing NaOH and NaNO, to a conical flask using a pipette and add a 2-3 drops of phenolphthalein indicator. The solution turns pink in color. 2. Fill the burette with the acid (HNO3) upto the zero mark (use a beaker to collect the excess acid). 3. Add HN03 to the solution in the conical flask in small volumes swirling after each addition. Continue until the pink color of the solution turns colorless and record this reading of the burette. 5. Measure the volume of the acid used. 6. Repeat the same procedure for second and third time. H2SO, solution stand burette meniscus top conical (N2OH + NANO,) solution white tile / stirrer Figure 1. Titration setup for experiment 5
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