Question

1.95 gm of coal sample was taken for nitrogen estimation by Kjeldahl’s method. The ammonia liberated required 9.5 ml of 0.4 N H₂SO₄ for neutralization. Calculate the percentage of nitrogen in coal sample.

Answer 1

Given:
Weight Of Coal= 1.95 gm Normality of H2SO4= 0.4 N
Volume of H2SO4= 9.5 ml
Required: % N=?
Formula: %N=`("vol of"  H_2SO^4xx"Normality"xx1.4)/"wt of coal"`

%N= `(9.5xx0.4xx1.4)/(1.95)`

%N= 2.72%