In Kjeldahl's method, the gas evolved from 1.325 g sample of a fertiliser is passed into 50 ml of 0.2030 N `H_2 SO_4 `.25.32 ml of 0.1980 N NaOH are required for the titration of unused acid. Calculate the percentage of nitrogen in the fertiliser.

Explanation

To solve the problem step by step, we will follow the method outlined in the video transcript while ensuring clarity in each calculation.

### Step 1: Calculate the milliequivalents of sulfuric acid (H₂SO₄)
The normality (N) of sulfuric acid is given as 0.2030 N, and the volume (V) is 50 mL.

The formula for milliequivalents (meq) is:
\[
\text{meq} = \text{Normality (N)} \times \text{Volume (L)}
...