Chapter 19, Problem 19.51P

(a)

Interpretation Introduction

Interpretation:

The indicator has to be find out for the titration of $\text{0}\text{.10}\text{M}{\text{CH}}_{\text{3}}{\text{NH}}_{\text{2}}$ with $\text{0}\text{.10}\text{M}\text{HCl}$.

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 $\text{0}\text{.50}\text{M}\text{HI}$ with $\text{0}\text{.10}\text{M}\text{KOH}$.

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.).