Chapter 15, Problem 15.128CHP

Interpretation Introduction

Interpretation:

$\text{pH}$ and concentrations of ${\text{NH}}_{\text{4}}{}^{\text{+}}$ and ${\text{NH}}_{\text{3}}$ has to be calculated, when solution is prepared by mixing $\text{20}\text{.0 g of NaOH and 0}\text{.500 L of}\text{1}{\text{.5 M NH}}_{\text{4}}\text{Cl}\text{.}$

Concept Introduction:

Henderson-Hasselbach Equation:

$\text{pH}$ of the buffer solution is given by below equation,

$\text{pH}\text{=}{\text{pK}}_{\text{a}}\text{+log}\frac{\text{[Base]}}{\text{[Acid]}}$

$\text{pH}$ of the solution, which it is prepared by mixing of $\text{20}\text{.0 g of NaOH}$ with $\text{0}\text{.500 L of}\text{1}{\text{.5 M NH}}_{\text{4}}\text{Cl}$ is $\text{9}\text{.55}$

The concentrations of ${\text{NH}}_{\text{4}}{}^{\text{+}}$ and ${\text{NH}}_{\text{3}}$ in the solution are $\text{1}\text{.0}\text{and 0}\text{.5}$ respectively.