Question

Why citric acid is added in the limit test of iron

Answer 1

Answer:

role of citric acid in limit test for iron

Answer 2

Citric acid is added for the precipitation of iron.

Iron in ammonical solution with thioglycolic acid in presence of citric acid is considered to be the limit test of iron:

• The limit test of iron checks its response in an ammoniacal arrangement in the presence of citric acid for the formation of iron thioglycolate.
• The formation of a pale pink or deep-reddish purple compound takes place.
• This compound is iron thioglycolate.
• Citric acid forms a complex with ammonia and helps it precipitate iron.
• Citric acid also acts as a catalyst in this reaction.