Question

Why nitric acid is used in chloride limit test?

Answer 1

Reasons: Nitric acid is added in the limit testof chloride to make solution acidic and helps silver chloride precipitate to make solution turbid at the end of process.

Answer 2

Nitric acid is used in chloride limit test is acidic and precipitate silver chloride

Explanation:

• The  Chloride Limit Test is based on the reaction of soluble chloride and silver nitrate in the presence of dilute nitric acid to form silver chloride that appears as solid particles  in solution (opalescence).  

• The opacity of the  sample solution should not be greater than the opacity of the standard solution. If the sample solution is less milky than the standard solution, the sample passes the Chloride Limit Test and vice versa.  

• In the final chloride test, nitric acid is added  to make the solution acidic and precipitate silver chloride, which makes the solution cloudy at the end of the process.