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in an experiment 29.5 milligram of an organic compound containing nitrogen was digested according to kjeldahl method and envolved ammoniabwas observed in 20 ml of 0.1 M HCL solution the excess acid required 15 ml of 0.5M NaOH solution for complete neutralization the percentage of nitrogen in the organic compound is

in an experiment 29.5 milligram of an organic compound containing nitrogen was digested according to kjeldahl  method and envolved ammoniabwas observed in 20 ml of 0.1 M HCL solution the excess acid required 15 ml of 0.5M  NaOH solution  for complete neutralization the percentage of nitrogen in the organic compound is

Grade:11

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
 
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%
 
Regards
Arun (askIITians forum exoert)

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