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

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

Grade:12th pass

1 Answers

Vikas TU
14149 Points
7 years ago
Milli Moles of excess acid = >  15 * 0.1 => 1.5 mm
Ammonia absorbed in => 20*0.1 – 1.5 => 2 – 1.5 = 0.5 mmoles.
Mmoles of Nitrogen in Ammonia = 0.5
mass of N => 0.5 x 10^-3 x 14 = > 7 x 10^-3 gm. or => 7 mg
7*100/29.5  = > 23.72%

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