Copper sulphate is considered an acidic salt. When dissolved in water, it undergoes hydrolysis, where the sulfate ions react with water molecules to form hydrogen ions (H+).

The chemical equation for the hydrolysis of copper sulphate is:

CuSO4 + 2H2O → Cu(OH)2 + H2SO4

Here, sulfuric acid (H2SO4) acts as a weak acid, releasing hydrogen ions (H+) into the solution, resulting in an acidic pH.