Question

chemical reaction involved in limit test for iron ​

Answer 1

Explanation:

Principle: Limit test of Iron is based on the reaction of iron in ammonical solution with thioglycollic acid in presence of citric acid to form iron thioglycolate which is pale pink to deep reddish purple in color.

Answer 2

Chemical reaction involved in limit test for iron:

• Limit test is used in the identification and quantitatively measure the impure substances in the chemical compounds.
• Limit test of iron uses the following chemical substances : citric acid , thioglycollic acid,  ammonia solution.
• Thioglycollic acid is a sensitive oxidizing agent which converts ferrous ions (Fe (II)) into  ferric (Fe III)
• Ammonia is used in the test to give alkaline condition.
• The precipitation of iron is done with the help of citric acid.
• Ferrous ion reacts with the thioglycolic acid in the ammonia solution and forms iron thioglycolate.
• It results in the conversion of pale pink  to deep reddish purple colour.
• The colour formation is compared with the standard solution and the impurity is determined.

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