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In Kjeldahl's method, 29.5 mg of an orga...

In Kjeldahl's method, 29.5 mg of an organic compound containing nitrogen was digested and the evolved ammonia was absorbed in 20 mL of 0.1 N HCl solution. The excess of the acid required 15 mL of 0.1 N NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

A

29.5

B

`59.0`

C

47.4

D

23.7

Text Solution

Verified by Experts

The correct Answer is:
D
Weight of substance taken = `29.5 xx 10^(-3) g " "` Volume of acid taken = 20 mL of 0.1 NHCI
Now 15 ml of 0.1 N NaOH = 15 mL of 0.1 N HCI
`:.` Volume of acid used = 20 - 15 = 5 mL of 0.1 NHCI
%N = `(1.4xx "Volume"xx"Normality")/("Weight of substance taken") = (1.4xx5xx0.1)/(29.5 xx10^(-3))= 23.73`
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