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Kjeldahl's Method - Practice Questions & MCQ

Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET

Quick Facts

  • Kjeldahl's Method is considered one the most difficult concept.

  • 10 Questions around this concept.

Solve by difficulty

Iodoform can be prepared from all except :

In the given transformation, which of the following is the most appropriate reagent ?

Concepts Covered - 1

Kjeldahl's Method

The compound containing nitrogen is heated with concentrated sulphuric acid. Nitrogen in the compound gets converted to ammonium sulphate. The resulting acid mixture is then heated with excess of sodium hydroxide. The liberated ammonia gas is absorbed in an excess of standard solution of sulphuric acid. The amount of ammonia produced is determined by estimating the amount of sulphuric acid consumed in the reaction. It is done by estimating unreacted sulphuric acid left after the absorption of ammonia by titrating it with standard alkali solution. The difference between the initial amount of acid taken and that left after the reaction gives the amount of acid reacted with ammonia.

\\\text {Organic compound }+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \stackrel{2 \mathrm{NaOH}}{\longrightarrow} \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{NH}_{3}+2 \mathrm{H}_{2} \mathrm{O}

Kjeldahl method is not applicable to compounds containing nitrogen in nitro and azo groups and nitrogen present in the ring (e.g. pyridine) as nitrogen of these compounds does not change to ammonium sulphate under these conditions.

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Reference Books

Kjeldahl's Method

Chemistry Part II Textbook for Class XI

Page No. : 365

Line : 31

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