The ammonia evolved from 0.21 g of an organic compound by Kjeldahl method neutralised 15 ml of N/20 sulphuric acid solution. Calculate the percentage of nitrogen.

The ammonia evolved from 0.21 g of an organic compound by Kjeldahl met

1.	The ammonia evolved from 0.21 g of an organic compound by Kjeldahl method neutralised 15 ml of N/20 sulphuric acid solution. Calculate the percentage of nitrogen.
Answer» Solution :`"weight of organic compound = 0.21 G"` `"Normality of ACID "=(N)/(20)` Volume of standard acid neutralised by ammonia = 15 ML 1000 ml of 1N ammonia contains = 14 g of nitrogen 15 ml of ammonia of normality `(N)/(20)" conains nitrogen "=(14xx15xx1)/(1000xx20)` 0.21 g of compound contains nitrogen `=(14xx15)/(1000xx20)` 100 g of compound contains nitrogen `=(14xx15xx100)/(1000xx20xx0.21)=5g` `therefore"Percentage of nitrogen = 5"`