0-7g of an organic compound was Kjeldahlised and ammonia evolved was absorbed in 50 ml of semi-molar 0-5 M H 2 SO 4- The residual acid required 80 ml of 0-5 M NaOH- Determine the percentage of nitrogen in the compound-a- 80b- 40c- 20d- 10

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Byju's Answer

Standard XII

Chemistry

Stoichiometric Calculations

0.7g of an or...

Question

0.7g of an organic compound was Kjeldahlised and ammonia evolved was absorbed in 50ml of semi-molar (0.5M) H₂SO₄. The residual acid required 80ml of 0.5M NaOH. Determine the percentage of nitrogen in the compound.
a.) 80
b.) 40
c.) 20
d.) 10

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Solution

In these kinds of problems start from the ending. Here equivalents present in NaOH = 80* 0.5 = 40 m.eqns hence the total equivalents ofH₂ SO₄used form NaOH = 40 m.eqns total equivalents ofH₂ SO₄. = 500.52....(here 2 for giving two hydrogens per molecule, it is also called n-factor) = 50 m.eqns hence the number of equivalents ammonia = 50 - 40 = 10 m.eqns. 1 equivalent contains 1 nitrogen molecule, hence total weight of nitrogen = 10* 10^-3 * 14 = 0.14 grams hence percentage of nitrogen = 0.14/0.7 *100 = 20 %

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