Question

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Explain Kjeldahl's method briefly
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Answer 1

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Answer 2

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✔✔In the Kjeldahl's method, ✔✔
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●Compound containing nitrogen is heated with conc.H2SO4.

●Nitrogen gets converted into (NH4)2SO4.

●Resulting acidic mixture is heated with an excess of NaOH.

●The liberated NH3 gas is absorbed in an excess of a standard solution of H2SO4.

●Amount of NH3 produced is determined by estimating the amount of H2SO4consumed in the reaction, which is calculated by subtracting the un-reacted amount of H2SO4 from its total amount.



==> This method is not applicable to the compounds containing nitrogen in nitro and azo groups; and to the nitrogen-containing ring (pyridine). This is because the nitrogen present in these compounds does not change to (NH4)2SO4 under these conditions.

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# Nikky