Why Sulphuric acid can form two types of salts?

 Why Sulphuric acid can form two types of salts?

Dilute Sulphuric acid reacts with a base to form salt and water. Sulphuric acid is a dibasic acid and it can produce two types of anions i.e. Sulphate ion (SO₄^2-  ) and bisulphate ion (HSO₄^1- ) when it is dissolved in water. Hence Sulphuric acid can form two types salts i.e. a normal salt and an acid salt when it reacts with a base.

H₂SO₄ + NaOH  --> NaHSO₄ + H₂O

H₂SO₄ + 2NaOH  --> Na₂SO₄ + 2H₂O