Question

what is role of ammonia in limit test of iron?​

Answer 1

Explanation:

The test depends upon the reaction between ferrous iron and thioglycollic acid in the presence of ammonia. When a pale pink to deep reddish purple colour is produced. ... Citric acid forms a soluble complex with iron and prevents its precipitation by ammonia as ferrous hydroxide

Answer 2

Concept: Ammonia is a solution used as cleaning fluid.

In gas, it is a colourless gas with pungent smell.

Find: Write the role of ammonia in limit test of iron.

Solution: The role of ammonia in limit test of iron is to make the solution alkaline. The purpose of a limit test is to find impurities in a substance and compared it with the standard.

Final answer: To make solution alkaline.

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