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CBSE Class 11-science Answered

0.25gm of an organic compound in kjeldahl's method ,produced ammonia gas which was absorbed by 25ml of 0.5M H2SO4 . The residual acid required 30ml of 0.5M NaOH for complete neutralisation . find the percentage composition of nitrogen in the organic compound
Asked by satya785583 | 16 Mar, 2019, 08:58: PM
answered-by-expert Expert Answer
Given:
 
Mass of organic compound = 0.5 g
 
The residual acid required 30 ml of 0.5 M NaOH for complete neutralisation.
 
30 ml 0.5 M NaOH solution = 30/2 ml of 0.5 H2SO4 
 
                                       = 15 ml of of 0.5 H2SO4 
 
Acid consumed during the absorption of evolved ammonia = 25-15
 
                                                                                    = 10 ml
 
10 ml of 0.5 M H2SO4 =  20 ml 0.5 M NH3 
 
As 1000 ml of 1 M NH contains 14 g of nitrogen
 
So, 20 ml 0.5 M NH3 will contain = 
                                             space equals space fraction numerator 14 cross times 20 over denominator 1000 end fraction cross times 0.5

space equals space 0.14 space straight g space of space straight N
 
 
Percentage of nitrogen = 
 
                                 equals space fraction numerator 0.14 over denominator 0.5 end fraction cross times 100
space
space equals space 28 percent sign
 
The percentage composition of nitrogen in the organic compound is 28 %.
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