Question

Disecuse modification of kjeldals method of estimation for nitrogen by using boric acid and 0.405 gm ab organic compound of analyzed by kejdhals method the liberated ammonium was absoberd in 37.5 ml of 1 N H2so4 solution

Answer 1

Answer:

10 ml of 1MH

2

SO

4

corresponds to 10 mmol.

It will neutralize 20 mmol of NH

3

.

Weight of N=

1000

14×20

g=0.280g.

Thus 0.75 g of sample of organic compound contains 0.280 g of nitrogen.

The percentage of nitrogen in the organic sample is

0.75

0.280

×100=37.33%.