Chapter 19, Problem 19.61P

(a)

Interpretation Introduction

Interpretation:

The indicator has to be find out for the titration of $\text{0}\text{.5}\text{M}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{NH}$ with $\text{0}\text{.5}\text{M}\text{HBr}$.

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 $\text{0}\text{.2}\text{M}\text{KOH}$ with $\text{0}\text{.2}\text{M}{\text{HNO}}_{\text{3}}$.

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.).