Question

How many ml of 1 M H₂SO₄ solution is required to neutralise 10 ml of 1 M NaOH solution?

(a) 2.5 ml

(b) 5.0 ml

(c) 10.0 ml

(d) 20.0 ml

Answer 1

Correct option is (b) 5.0 ml

Acids and bases react in Equivalents.

So Normality of H₂SO₄ = Molarity × 2

So 1 M H₂SO₄ = 1 × 2 = 2N

Normality of NaOH = Molarity × 1

So Normality of NaOH = 1 × 1 = 1N

So 1 ml of 2N (1M) H₂SO₄ is required to neutralise 2 ml of 1 N (1M) NaOH.

So 5 ml of 1M H₂SO₄ is required to neutralise 10 ml of 1M.