Chapter 19, Problem 96A

Interpretation Introduction

Interpretation : The name and formula of the salt is to be identified.

Concept Introduction : One of the products of a neutralization reaction is salt. Salt constitutes a cation from a base and an anion from an acid. They are neutral in solution form.

Answer to Problem 96A

The name and formula of the salt is ammonium and ${\text{NH}}_{\text{4}}\text{Cl}$ respectively.

Explanation of Solution

The vapors of the strong acid and the weak base combine to form a white salt.

  $\text{HCl}\left(aq\right)+{\text{NH}}_{\text{3}}\left(aq\right)\to {\text{NH}}_{\text{4}}\text{Cl}\left(s\right)$

The white salt formed is ammonium chloride.

Interpretation Introduction

Interpretation : The kind of solution that this salt form when it dissolves in water is to be identified.

Concept Introduction : One of the products of a neutralization reaction is salt. Salt constitutes a cation from a base and an anion from an acid. They are neutral in solution form.

Answer to Problem 96A

The acidic solution is formed when the salt is dissolved in water.

Explanation of Solution

The strong acid like hydrochloric acid combines with weak base like ammonia to give the ammonium chloride.

The ammonium chloride solution dissolves in water to give ammonium ion.

  ${\text{NH}}_{\text{4}}\text{Cl}+{\text{H}}_{\text{2}}\text{O}\to {\text{NH}}_{\text{4}}^{\text{+}}+{\text{Cl}}^{-}$

Since the salt is formed from strong acid and weak base, the aqueous solution of ammonium chloride gives the acidic solution whose pH is less than 7.