Question

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 MH₂SO₄ solution. The percentage of nitrogen in the compound is ______. (Nearest integer)

Options

• 64

• 96

• 32

• 20

Answer 1

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 MH₂SO₄ solution. The percentage of nitrogen in the compound is 64.

Explanation:

Basicity of H₂SO₄ = 2

M_eq of H₂SO₄ used by NH₃ = 12.5 × 1 × 2 = 25

% of N in the compound = `(25 xx 10^-3 xx 14 xx 100)/0.55` = 63.6 ≈ 64%