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 1M H 2 S O 4 . The percentage of nitrogen in the soil is

Question

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 1M H 2 S O 4 . The percentage of nitrogen in the soil is, 37.33, 43.33, 45.33, 35.33

MARKS App · Accepted Answer

∵ M × V ( ml ) = m mol 10 m mol H 2 S O 4 = 20 m mol of N H 3 [ H 2 S O 4 + 2N H 3 → ( N H 4 ) 2 S O 4 ] 1 mol N H 3 contains 14 g nitrogen 20 × 1 0 - 3 mol N H 3 contains 14 × 20 × 1 0 - 3 nitrogen 0.75 g of sample contains % Nitrogen = 14 × 20 × 1 0 - 3 0.75 × 100 = 37.33 %

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