Why thioglycolic acid is added to the limit test of iron ?

1.	Why thioglycolic acid is added to the limit test of iron ?
Answer» Explanation: CITRIC acid HELPS PRECIPITATION of iron with AMMONIA by forming a complex with it the Thioglycolic acid helps OXIDES iron 2 to iron 3

Answer»

Explanation:

CITRIC acid HELPS PRECIPITATION of iron with AMMONIA by forming a complex with it the Thioglycolic acid helps OXIDES iron 2 to iron 3

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