0.3 g of an organic compound on Kjeldahl’s analysis gave enough ammo

1.	0.3 g of an organic compound on Kjeldahl’s analysis gave enough ammonia to just neutralise 30 mL of 0.1N H2SO4 . Calculate the percentage of nitrogen in the compound.
Answer» Weight of organic compound (w) = 0.3 g Strength of sulphuric acid used (N) = 0.1 N Volume of sulphuric acid used (V) = 30 mL 30 ml of 0.1 N sulphuric acid = 30 ml of 0.1 N ammonia Percentage of nitrogen = \(\Big(\frac{14\times NV}{1000\times w}\Big)\)x 100 = \(\Big(\frac{14\times0.1\times30}{1000\times0.3}\Big)\)x 100 = 14%

0.3 g of an organic compound on Kjeldahl’s analysis gave enough ammonia to just neutralise 30 mL of 0.1N H2SO4 . Calculate the percentage of nitrogen in the compound.

Answer»

Weight of organic compound (w) = 0.3 g

Strength of sulphuric acid used (N) = 0.1 N

Volume of sulphuric acid used (V) = 30 mL

30 ml of 0.1 N sulphuric acid = 30 ml of 0.1 N ammonia

Percentage of nitrogen = \(\Big(\frac{14\times NV}{1000\times w}\Big)\)x 100

= \(\Big(\frac{14\times0.1\times30}{1000\times0.3}\Big)\)x 100 = 14%