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In Kjedhal's estimation of nitrogen, the...

In Kjedhal's estimation of nitrogen, the ammonia obtained from 0.5 of an organic subsatce was passed into `100cm^(3)` of `(M)/(10)H_(2)SO_(4)`. The excess of acid required `154cm^(3)` of `(M)/(10)` NaOH for neutralisation. Calculate the percentage of nitrogen in the compound.

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Mass of the organic compound = 0.5 , Volume of standard `H_(2)SO_(4)` taken = `100cm^(3)` of `(M)/(10)` solution
Let volume fo unused `H_(2)SO_(4) = V_(1)`
Volume of NaOH requried for excess acid = `154cm^(3)` of `(M)/(10)` solution
Volume of `(M)/(10)H_(2)SO_(4)` solution unused `(V_(1)) = (154)/(2)=77cm^(3)`
Volume of `(M)/(10)H_(2)SO_(4)` used by `NH_(3) = 23cm^(3)` , Millimoles of `H_(2)SO_(4)` used by `NH_(3) = (23)/(10) = 2.3`
Millimoles of `NH_(3) = 2 xx "Millimoles of" H_(2)SO_(4)=2xx2.3 = 4.6`
perecntage of nitrogen = `(14 xx 4.6 xx 100)/(1000 xx 0.5) = 12.88`
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