In Kjeldahl's method, the gas evolved from 1.325g sample of fertilizer is passed into 50.0 mL of 0.2030N `H_(2)SO_(4)`. 25.32 mL of 0.1980 N NaOH are required for percentage of nitrogen in fertilizer ?

Options

A. 0.025
B. 0.0543
C. 0.0648
D. 0.1202

Answer

B

Explanation

Meq. Of acid takne `=0.2030xx50=10.15`
Meq. Of acid used by `NaOH=0.1980xx25.32=5.013`
`:.` Meq. Of `NH_(3)` (i.e.)`N V =5.137`
`%N=(1.4xx5.137)/(1.325)=5.43%`