A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 ml of 0.5 M H 2 SO 4 . The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

Question

Philoid · Accepted Answer

Given that, total mass of organic compound=0.50g

60ml of 0.5M solution of NaOH was required by residual acid for neutralisation.

60ml of 0.5M NaOH solution =ml of 0.5M H₂SO₄

=30ml of 0.5M H₂SO₄

Therefore, acid consumed in absorption of evolved ammonia is (50-30)ml=20ml

Again,20ml of 0.5M H₂SO₄=40ml of 0.5M NH₃

Therefore, 40ml of 0.5M NH₃ will contain=

=0.28g of N

Therefore, the % of nitrogen in 0.50g of organic compound==56%.

A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 ml of 0.5 M H2SO4. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 ml of 0.5 M H₂SO₄. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.