In Kjedhal's estimation of nitrogen, the ammonia obtained from 0.5of 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.

In Kjedhal's estimation of nitrogen, the ammonia obtained from 0.5of a

1.	In Kjedhal's estimation of nitrogen, the ammonia obtained from 0.5of 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.
Answer» Solution :Massof 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`