A $$0.166$$ g sample of an organic compound was digested with conc. $$H2SO4$$ and then distilledwith NaOH. The ammonia gas evolved was passed through $$50.0$$ mL of $$0.5$$ N $$H2SO4$$. The acid used for ammonia if neutralised requires $$30.0$$ mL of $$0.25$$ N NaOH for complete neutralization. The mass percentageof nitrogen in the organic compound $$is____$$.

Question

A $$0.166$$ g sample of an organic compound was digested with conc. $$H2SO4$$ and then distilledwith NaOH. The ammonia gas evolved was passed through $$50.0$$ mL of $$0.5$$ N $$H2SO4$$. The acid used for ammonia if neutralised requires $$30.0$$ mL of $$0.25$$ N NaOH for complete neutralization. The mass percentageof nitrogen in the organic compound $$is____$$.

Infinity Learn · Accepted Answer

millieq of ammonia = millieq of sulphuric acid used=millieq of NaOH=30x.25=.75 grams of nitrogen = 7.5x14x10-3= 0.105 g % of nitrogen =0.105x1000.166=63.25%

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