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Question
The ammonia evolved form 0.20 g of an organic compound by Kjeldahl method neutralized 15 ml of N/20 sulphuric acid solution. Calculate the percentage of Nitrogen.
Solution
Weight of organic compound = 0.20 g
Volume of sulphuric acid taken = 15 ml
Strength of sulphuric acid taken = `"N"/20` = 0.05 N
Percentage of nitrogen = `(14 xx "NV")/(1000 xx 10) xx 100`
`= (14 xx 0.05 xx 15)/(1000 xx 0.20) xx 100`
`= 1050/200` = 5.25
% of nitrogen = 5.25%
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