An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

1. An aqueous solution of copper sulphate (CuSO4) contains Cu²⁺ ions and SO₄²⁻ ions dissolved in water (H₂O). 2. Copper sulphate is a salt formed from a weak base (Copper Hydroxide, Cu(OH)₂) and a strong acid (Sulphuric Acid, H₂SO₄). 3. When dissolved in water, the Cu²⁺ ion reacts with water (hydrolysis) to a small extent: Cu²⁺ + 2H₂O ⇌ Cu(OH)₂ + 2H⁺. 4. This reaction produces excess H⁺ ions, making the solution acidic in nature. 5. The SO₄²⁻ ion is the conjugate base of a strong acid and does not hydrolyze significantly. 6. Dialysis is purification, electrolysis uses current for decomposition, and photolysis is decomposition by light. Hydrolysis is the reaction with water causing the acidity.