25 mL of a solution of ferric alum containing 1.25 g of the salt was boiled with iron…

CHEMISTRY · Multi-part · CBSE · Chemistry · Redox Reactions · Redox Reactions

Problem

25 mL of a solution of ferric alum

\text{Fe}_2(\text{SO}_4)_3 \cdot (\text{NH}_4)_2\text{SO}_4 \cdot 24\text{H}_2\text{O}

containing 1.25 g of the salt was boiled with iron when the reaction

\text{Fe} + \text{Fe}_2(\text{SO}_4)_3 \rightarrow 3\text{FeSO}_4

occurred. The unreacted iron was filtered off and solution treated with 0.107N

\text{KMnO}_4

in acid medium. (1) What is titre value? (2) If Cu had been used in place of Fe, what would have been titre value?