For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of sulphuric acid. The unreacted acid required 20 mL of sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is

Engineering

Chemistry

Estimation Percentage of Element

Question

10%

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N_eq NH₃ + n_eq NaOH = n_eq H₂SO₄

_{$or, a \times 1 + \frac{20 \times \frac{1}{10} \times 1}{1000} \frac{60 \times \frac{1}{10} \times 2}{1000}$}

$∴$ a = 0.01

Mass of nitrogen present

= 0.01 × 14 = 0.14gm

$∴ % N = \frac{0 .14}{1 .4} \times 100 = 10 %$