While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0 . 25 g of the compound neutralized 2 . 5 mL of 2 MH 2 SO 4 . The percentage of nitrog

Question

While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0 . 25 g of the compound neutralized 2 . 5 mL of 2 MH 2 SO 4 . The percentage of nitrogen present in organic compound is _____ .

TestHub · Accepted Answer

The equivalent of ammonia contains 14 grams of nitrogen. The number of equivalents of acid used is equal to number of equivalents of ammonia evolved.
Number of equivalents of acid used $= Normality \times Volume in L$
Hence, the percentage of nitrogen can be calculated form the following
$% N = \frac{1.4 (N_{1} V_{1})}{mass of organic compound}$
$% N = \frac{1.4 (2.5 \times 2 \times 2)}{0.25} = 56$

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