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Question

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

A
59.0
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B
47.4
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C
23.7
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D
29.5
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Solution

The correct option is C 23.7
Moles of HCl reacting with ammonia = moles of HCl absorbed

= moles of NaOH solution required
=(20×0.1×103)(15×0.1×l03)
= moles of NH3 evolved
= moles of nitrogen in organic compound
Weight of nitrogen in organic compound =0.5×103×14=7×103g
% nitrogen =7×10329.5×103×100=23.7 %

Option C is correct.

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