1.

In Kjeldahl's estimation of nitrogen, the ammonia evolved from 0.5g of an organic compound neutralised 10ml of 1M H_(2)SO_(4). Calculate the percentage of nitrogen in the compound

Answer»

Solution :N of compound is converted into `NH_(3)` and is estimated by TITRATION.
1M of 10mL`H_(2)SO_(4)` = 1M of 2mL `NH_(3)` , 1000 mL of 1M ammonia contains 14g nitrogen
20mL of 1 M ammonia contains `(14 xx 20)/(1000)g N_(2)` , Precentage of nitrogen = `(14 xx 20 xx 100)/(1000 xx 0.5) = 56.0`


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