Question

State two methods by which salts can be prepared. Give one example of each.

Answer 1

Salts which are neutral substances can be prepared from the following methods:

1. Neutralization Reaction – It is the reaction between an acid and a base to produce salt, water and heat.

Example: Hydrochloric acid reacts with sodium hydroxide to produce sodium chloride (common salt), water and heat.

The reaction is represented by the following equation:

$\mathrm{HCl}+\mathrm{NaOH}\underset{}{\to \mathrm{NaCl}+{\mathrm{H}}_2\mathrm{O}}$

2. Reaction of metals with acids - Metals react with acids to replace hydrogen from the acids, thereby producing salts and liberating hydrogen gas.

Example: Zinc reacts with dilute sulphuric acid to form zinc sulphate salt liberating hydrogen gas.

The reaction is given below:

$\mathrm{Zn}+{\mathrm{dilH}}_2{\mathrm{SO}}_4\underset{}{\to }{\mathrm{ZnSO}}_4+{\mathrm{H}}_2\mathrm{O}$