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0.4 gm of an organic compound was treate...

0.4 gm of an organic compound was treated according to Kjeldahl's method. The ammonia evolved was absorbed in 50 ml or `0.5MH_3PO_3`. The residual acid required 30 ml of `0.5MCa(OH)_2` Find the percentage of `N_2` in the compound.

Text Solution

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Here `H_3PO_3` is dibasec (i.e., `n=2)`
The nomalities of `H_3PO_3=Mxxn=0.5xx2=1N`.
mEq. Of `H_3PO_3=50xx0.5xx2=50`
mEq. Of `Ca(OH)_2=30xx0.5xx2=30`
Exess of acid used to neutraloise `NH_3=50-30=20`
percentage of `N_2`
`=(1.4xxmEq." of acid used to n eutralise "NH_3)/("weight of compound")`
`=(1.4xx20)/(0.4)=70%`
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