10.3 Salts (Preparation)

10.3.1 Preparation

Salts may be water soluble or insoluble. The methods used for the preparation of salts are based on their solubility in water. Salts may be water soluble or insoluble. The methods used for the preparation of salts are based on thei solubility in water.

General Methods for the Preparation of Salts

There are five general methods for the preparation of salts. Four methods make soluble salts but one prepares insoluble salts.

(i) Preparation of soluble salts

Soluble salts are often prepared in water. Therefore, they are recovered by evaporation or crystallization.

(a) By the reaction of an acid and a metal: (Direct Displacement method)

This is direct displacement method in which hydrogen ion of acid is replaced by a reactive metal. Such as calcium, magnesium, zinc and iron, e.g.

(b) By the reaction of an acid and a base: (Neutralization method)