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Question

1.2g of an organic compound on Kjeldahl method liberates ammonia which consumes 30cm3 of 1N HCl. The percentage of nitrogen in the organic compound is?


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Solution

Step 1: Given data

Weight of the organic compound (w) =1.2g

Amount of ammonia consumed = 30cm3=30ml

Normality of HCl = 1N

Step 2: Formula used

The percentage of Nitrogen evolved can be calculated using the formula:

1.4×N×V(ml)w(gm)

where, N is the normality of the acid

V is the volume of ammonia

w is the weight of the organic compound

Step 3: Calculate the percentage of Nitrogen.

Put the given values in the formula to calculate the percentage of nitrogen in the organic compound.

%ofN=1.4×1×301.2=35%

Hence, the percentage of nitrogen in the organic compound is 35%.


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