Chapter 14, Problem 78E

Interpretation Introduction

Interpretation:

The resulting color when a drop of bromthymol blue and a drop of phenolphthalein are added to a beaker of distilled water is to be stated.

Concept introduction:

Indicators are typically weak acids or weak bases. They are added to solutions in small amounts to determine the $\text{pH}$ of a solution visually. The conjugate base or acids of the indicators have different colors due to different absorption spectra. They change the color due to change in $\text{pH}$.