Why heating is not required in F.A.S. and potassium
parmanganate titration?
Answers
Answer:
Iron is oxidised during the reaction and its oxidation number changes from +2 to +3. In this titration heating of ferrous ammonium sulphate solution is not required because reaction rate is very high even at room temperature.
Concept:
Titration: Titration is a common laboratory method of chemical qualitative analysis that is used to calculate the concentration of a given analyte or a given unknown solution.
Titration of F.A.S. and potassium permanganate: F.A.S. stands for Ferrous ammonium sulphate. In the given question, we have titration of ferrous ammonium sulphate solution with potassium permanganate solution.
Answer:
Heating is not required in ferrous ammonium sulphate and potassium permanganate titration because the rate of this reaction is already very fast at room temperature. So, there is no need to increase the rate of reaction.
Moreover, if we heat F.A.S. before titration, then oxygen oxidizes ferrous ions into ferric ions which can result in errors in calculations. This is the reason why ferrous ammonium sulphate is not heated before titration.
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