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  • 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 <img alt="\frac{M}{10}" src="https://learn.careers360.c

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 \frac{M}{10}   sulphuric acid.  The unreacted acid required 20 mL of  \frac{M}{10}  sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is :

Option: 1

6%


Option: 2

10%


Option: 3

3%


Option: 4

5%


Answers (1)

best_answer

We know,

% N = \frac{1.4 \times milliequivalents of acid consumed}{mass\: of\: organic\: compound}

milliequivalents of acid consumed = 60 \times \frac{1}{10} \times 2- 20 \times \frac{1}{10} \times 1

                                                        =10

% N= \frac{1.4 \times 10}{1.4}= 10 %

Hence, the option number (2) is correct.

 

Posted by

SANGALDEEP SINGH

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