The Kjeldahl method for nitrogen estimation relies on converting organic nitrogen into . Which of the following classes of organic molecules generally FAIL to yield their nitrogen quantitatively under

Question

The Kjeldahl method for nitrogen estimation relies on converting organic nitrogen into $(NH_4)_2SO_4$. Which of the following classes of organic molecules generally FAIL to yield their nitrogen quantitatively under standard Kjeldahl digestion conditions?

Prashant Kotian · Accepted Answer

Correct answer: A,B,C. The Kjeldahl method does not accurately estimate nitrogen if the compound contains nitrogen in a ring (pyridine, quinoline), in a nitro or nitroso group, or in an azo or diazonium group, as these do not completely convert to ammonium sulphate upon boiling with concentrated . Primary amines, however, are easily estimated.

💡 Solution & Explanation

Practice 22,000+ questions like this