Chapter 19, Problem 19.53P

(a)

Interpretation Introduction

Interpretation:

The indicator has to be find out for the titration of $\text{0}\text{.25}\text{M}{\text{C}}_{\text{6}}{\text{H}}_{\text{5}}\text{COOH}$ with $\text{0}\text{.25}\text{M}\text{KOH}$.

Concept Introduction:

Basis of an indicator detection:

  An indicator is a substance (mostly in liquid form) that it changes its colour based on the $\text{pH}$ values.

For an example, phenolphthalein is an acid-base indicator, and its color changes when the $\text{pH}$ of the solution is changed from acidic to basic (used in the $\text{pH}$ range of 8.3 – 10.).

(b)

Interpretation Introduction

Interpretation:

The indicator has to be find out for the titration of $\text{0}\text{.5}\text{M}{\text{NH}}_{\text{4}}\text{Cl}$ with $\text{0}\text{.5}\text{M}\text{NaOH}$.

Concept Introduction:

Basis of an indicator detection:

  An indicator is a substance (mostly in liquid form) that it changes its colour based on the $\text{pH}$ values.

For an example, phenolphthalein is an acid-base indicator, and its color changes when the $\text{pH}$ of the solution is changed from acidic to basic (used in the $\text{pH}$ range of 8.3 – 10.).