Chapter 16, Problem 16.42QE

Interpretation Introduction

Interpretation:

The amount of ammonium chloride that is required to add to $\text{500}\text{.0 mL of 0}\text{.137 M}$ ammonia to prepare a $\text{pH 9}\text{.80}$ buffer has to be calculated.

Concept introduction:

The pH of solution is calculated by using Henderson – Hasselbalch equation,

  $\text{pH = pKa + log }\left(\frac{\left[{\text{A}}^{\text{-}}\right]}{\left[\text{HA}\right]}\right)$