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A sample of 0.50 g of an organic compoun...

A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 ml of 0.5 M `H_(2)SO_(4)`. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

Text Solution

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mEq. Of acid `=50xx0.5xx2=50`
mEq. Of base `=60xx(1)/(2)xx1=30`
excess of acid used to neutralise
`NH_3=50-30=20mEq`
percentage of `N_2`
`=(1.4xxmEq". Of acid used")/("weight of compound")=(1.4xx20)/(0.5)=56.0%`
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