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Organic Chemistry-Some Basic Principles and Techniques

Quantitative analysis

50 mg of an organic compound containing nitrogen was digested

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50 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 ___.

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Updated on: Jan 15, 2023

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Elijah Discussed

50 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 ___.

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Text solutionVerified

M_{1} V_{1} = M_{2} V_{2}

(HCl) (NaOH)

0.1 \times V V_{HCl} = 0.1 \times 15 = 15 mL

∴

Volume of

HCl

used by

NH_{3} = 20 - 15 or 5 mL

%

N = \frac{1.4 \times N \times V}{W}

N =

Normality of acid used

V =

Volume of acid used

W =

weight of organic compound
For

HCl

, normality

=

Molarity

(∵

Basicity is 1

)

%

age of

N = \frac{1.4 \times 0.1 \times 5}{50 \times 1 0 ^{- 3}} = 14%

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Question Text	50 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 ___.
Updated On	Jan 15, 2023
Topic	Organic Chemistry-Some Basic Principles and Techniques
Subject	Chemistry
Class	Class 11
Answer Type	Text solution:1 Video solution: 3
Upvotes	299
Avg. Video Duration	4 min

Text solutionVerified

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