For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of 10 M sulphuric acid. The unreacted acid required 20 mL o

Question

For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of 10 M ​ sulphuric acid. The unreacted acid required 20 mL of 10 M ​ sodium hydroxide for complete neutralizaton. The percentage of nitrogen in the compound is :

TestHub · Accepted Answer

Moles of H₂SO₄ reacted with NH₃ = ( 60 − 20/2 ) × ( 1/10 ) /1000 = 0.005 m o l . Moles of N = 2 × M o l eso f H 2 ​ S O 4 ​ = 0.01 m o l . Mass of N = 0.01 × 14 = 0.14 g . Percentage of N = ( 0.14/1.4 ) × 100 = 10% .

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