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 M H₂SO₄ solution. The percentage of nitrogen in the compound is ______. (Nearest integer)

Options

• 61

• 62

• 63

• 64

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 M H₂SO₄ solution. The percentage of nitrogen in the compound is 64.

Explanation:

Normality = Molarity × n factor

N = 1 × 2

N = 2

% N = `(1.4 xx "N" xx "V")/("Mass of organic compound")`

% N = `(1.4 xx 2 xx 12.5)/0.55` 

= 63.63%

= 64%