Question

The ammonia evolved form 0.20 g of an organic compound by kjeldahl method neutralised 15ml of N/20 Sulphuric acid solution. Calculate the percentage of Nitrogen.

Answer 1

Weight of organic compound = 0.20 g

Volume of sulphuric acid taken = 15 ml

Strength of sulphuric acid taken = \(\frac{N}{20}\) = 0.05 N

Percentage of nitrogen = \(\frac{14\times NV}{1000\times10}\) x 100

= \(\frac{14\times0.05\times 15}{1000\times0.20}\) x 100

= \(\frac{1050}{200}\) = 5.25

% of nitrogen = 5.25%