Redox and Equivalent ConceptMedium
Question
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl′s method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is
Options
A.59.0
B.47.4
C.23.7
D.29.5
Solution
Moles of HCl reacting with
ammonia = (moles of HCl absorbed ) - (moles of NaOH solution required)
= (20 × 0.1 × 10-3) - (15 × 0.1 × 10-3)
= moles of NH3 evolved.
= moles of nitrogen in organic compound]
∴ wt. of nitrogen in org. comp = 0.5 × 10-3 × 14
= 7 × 10-3 g
% wt =
= 23.7 %
ammonia = (moles of HCl absorbed ) - (moles of NaOH solution required)
= (20 × 0.1 × 10-3) - (15 × 0.1 × 10-3)
= moles of NH3 evolved.
= moles of nitrogen in organic compound]
∴ wt. of nitrogen in org. comp = 0.5 × 10-3 × 14
= 7 × 10-3 g
% wt =
= 23.7 %Create a free account to view solution
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