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Grade: 12th pass
        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
one year ago

Answers : (1)

Vikas TU
6869 Points
							
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%
one year ago
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