Chapter 13, Problem 98QP

Interpretation Introduction

Interpretation:

The $\text{pH}$ of solutions that turns colourless and dark pink on adding phenolphthalein is to be determined.

Concept Introduction:

The $\text{pH}$ of a solution is measured by a $\text{pH}$ meter or by using indicators. Indicators are brightly coloured organic dyes and are weak acids and bases. They give different colours in different $\text{pH}$ ranges of the solution.