Chapter 10, Problem 10.28P

(a)

Interpretation Introduction

Interpretation:

Value of $\text{pH}$ for $0.010{\text{ M NH}}_{\text{4}}\text{Cl}$ has to be calculated.

Concept Introduction:

Formula to calculate $\text{pH}$ is given as follows:

  $\text{pH}=-\text{log}\left[{\text{H}}^{+}\right]$

(a)

Interpretation Introduction

Interpretation:

An indicator that allows titration of $\text{HCl}$ only and not ${\text{NH}}_{\text{4}}{}^{+}$ has to be selected.

Concept Introduction:

In an acid base-kind of titration, progress of the reaction is quantified by neutralization of analyte when the definite volume of titrant is added. The indicators used are sensitive to $\text{pH}$ changes. Suitability of such an indicator is governed by their ability to detect endpoints accurately when the equivalence point is reached. Most suitable indicators have a transition range of $\text{pH}$ coincides with $\text{pH}$ at equivalence point.