2. In titration experiment at 25°C, a total of 30 mL of 0.1 M NaOH was added dropwise to conical flask containing 25 mL of 0.1 M HCI and few drops of an indicator. Calculate the pH of the solution before the addition of NaOH, at half equivalence point and at the final volume of titration. Sketch a graph of pH against the volume of NaOH added. What is an acid-base indicator? By referring to Table 1 below, suggest the most suitable indicator to be used in the titration above and justify your answer. Table 1 Indicator Phenolphthalein Cresol red pH range 8.3-10.0 7.0-8.8 Bromothymol blue 6.0-7.6 Litmus 4.7-83

2. In titration experiment at 25°C, a total of 30 mL of 0.1 M NaOH was added dropwise to conical flask containing 25 mL of 0.1 M HCI and few drops of an indicator. Calculate the pH of the solution before the addition of NaOH, at half equivalence point and at the final volume of titration. Sketch a graph of pH against the volume of NaOH added. What is an acid-base indicator? By referring to Table 1 below, suggest the most suitable indicator to be used in the titration above and justify your answer. Table 1 Indicator Phenolphthalein Cresol red pH range 8.3-10.0 7.0-8.8 Bromothymol blue 6.0-7.6 Litmus 4.7-83

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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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

2. In titration experiment at 25°C, a total of 30 mL of 0.1 M NaOH was added dropwise to
conical flask containing 25 mL of 0.1 M HCI and few drops of an indicator. Calculate the
pH of the solution before the addition of NaOH, at half equivalence point and at the final
volume of titration. Sketch a graph of pH against the volume of NaOH added. What is an
acid-base indicator? By referring to Table 1 below, suggest the most suitable indicator to be
used in the titration above and justify your answer.
Table 1
pH range
Indicator
Phenolphthalein
Cresol red
8.3-10,0
7.0-8.8
Bromothymol blue
6.0-7.6
Litmus
4.7-8.3

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