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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Which of the indicators in Fig. 14-8 could be used for the titrations in Exercises 57 and 59?

Interpretation Introduction

Interpretation: The indicators from Figure 148 that could be used for titrations in Exercise 57 and 59 are to be stated.

Concept introduction: The acid-base indicators show the color change with change in pH of the solution.

To determine: The indicators from Figure 148 that could be used for titrations in Exercise 57 and 59 .

Explanation

Explanation

The indicators that could be used for the titration of HClO4 and KOH are Phenol red, Bromothymol blue or Cresol red.

An indicator is a weak acid that remains in equilibrium with its conjugate base as,

HIn(aq)+H2O(l)H3O+(aq)+In(aq)

These acid and conjugate base have different colors. When the value of pH is low, at that time the concentration of H3O+ is high and therefore, equilibrium shifts in the left direction and the color of HIn in the solution. On the other hand, when the value of pH is high, then equilibrium shifts towards the right direction and the solution shows the color of In .

In Exercise 57 a strong acid HClO4 is titrated with a strong base KOH . As the KOH is added to HClO4 , the solution starts becoming basic in nature due to the addition of a strong base. Therefore, the indicators used are Phenol red, Bromothymol blue or Cresol red, as they lie in the pH range of 6.78.2 .

Explanation

The indicators that could be used for the titration of CH3COOH and KOH are Phenolphthalein, Thymolphthalein

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