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Concentration Terms - An Introduction (w/w etc)

For the estim...

Question

For the estimation of nitrogen, 0.7 g of an organic compound was digested by Kjeldhal's method and the evolved ammonia was passed in 100 mL of 0.1 M sulphuric acid. The excess acid required 10 mL of 0.5 M $B a (O H)_{2}$ for complete neutralization. The percentage of nitrogen in the compound is:

$10 %$

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$7 %$

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$20 %$

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$25 %$

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Solution

The correct option is C
$20 %$

$% N_{2} = \frac{1.4 \times m e q o f a c i d n e u t r a l i s e d}{w t . o f o r g a n i c c o m p o u n d} m e q o f H_{2} S O_{4} = 100 \times 0.2 = 20 m e q o f H_{2} S O_{4} n e u t r a l i z e d b y B a (O H)_{2} = 10 \times 0.5 \times 2 = 10 m e q o f H_{2} S O_{4} n e u t r a l i z e d = 20 - 10 = 10 % N_{2} = \frac{1.4 \times 10}{0.7} = 20 %$

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