In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M . The percentage of nitrogen in the soil is [2014]

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Solution

Q.
In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M $H_{2} {SO}_{4}$ . The percentage of nitrogen in the soil is [2014]

1 37.33

2 45.33

3 35.33

4 43.33

Ans.
(1)

$H_{2} {SO}_{4} + 2 {NH}_{3} ⟶ {({NH}_{4})}_{2} {SO}_{4}$

10 mL of 1 M $H_{2} {SO}_{4}$ = 10 mmol [ $∵ M \times V_{(mL)} = mmol$ ]

Acid used for the absorption of ammonia $= 10 mL of 2 N (or 1 M) H_{2} {SO}_{4}$

$% of N = \frac{1.4 \times N \times V}{W} = \frac{1.4 \times 2 \times 10}{0.75} = 37.33 %$

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