Chapter 16, Problem 88CE

(a)

Interpretation Introduction

Interpretation:

Balanced acid base reaction that produces ${\text{Na}}_{\text{2}}\text{S}$ has to be given.

Concept Introduction:

Type of a chemical reaction between acid and base is termed as acid base reaction. In acid base reaction ${\text{H}}^{\text{+}}$ ion of acid combines with ${\text{OH}}^{-}$ ion of base and forms water.

(b)

Interpretation Introduction

Interpretation:

Whether $\text{pH}$ of solution rises or fall on addition of ${\text{Na}}_{\text{2}}\text{S}$ to aqueous solution ${\text{H}}_{\text{2}}\text{S}$ has to be determined.

Concept Introduction:

$\text{pH}$ is defined as concentration of hydrogen ion. It also explains about the acidity of solution. It is also defined as negative logarithm of concentration of ${\text{H}}^{+}$.