Question

During estimation of nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.5 g of the compound in Kjeldahl's estimation of nitrogen, neutralized 10 mL of 1 M H₂SO₄. Find out the percentage of nitrogen in the compound.

Answer 1

1 M of 10 mL H₂SO₄ = 1M of 20 mL NH₃

1000 mL of 1M ammonia contains 14 g nitrogen 20 mL of 1M ammonia contains = \(\frac{14\times20}{1000}\)

Percentage of nitrogen = \(\frac{14\times20\times100}{1000\times0.5}\) = 56.0%