Question

Example on kjeldahl method

Answer 1

The solution is then distilled with a small quantity of sodium hydroxide, which converts the ammonium salt to ammonia. The amount of ammonia present, and thus the amount of nitrogen present in the sample, is determined by back titration. The end of the condenser is dipped into a solution of boric acid.

Answer 2

· It was then titrated with 0.5N sodium hydroxide , which neutralized the excess sulfuric acid in the solution which did not react with ammonia. ... Step 2: Distillation The purpose of this next step is to separate the ammonia (the nitrogen) from the digestion mixture. Step 3: Titration ...