A 0.05 mol sample of ferrous oxalate ( FeC ₂ O ₄ ) is titrated with a 0.1 M KMnO ₄ solution in an acidic medium. The volume of KMnO ₄ solution required for complete oxidation is ________ mL .

Step-by-step solution

During the oxidation of ferrous oxalate ( FeC ₂ O ₄ ), both Fe ²⁺ and C ₂ O ₄²⁻ ions are oxidized. Fe ²⁺ Fe ³⁺ + e^- (n-factor = 1 ) C ₂ O ₄²⁻ 2 CO ₂ + 2e^- (n-factor = 2 ) Total n-factor for FeC ₂ O ₄ = 1 + 2 = 3 . In an acidic medium, the n-factor of KMnO ₄ is 5 . According to the law of equivalence: Equivalents of FeC ₂ O ₄ = Equivalents of KMnO ₄ Moles of FeC ₂ O ₄ n-factor = Molarity Volume (in L) n-factor 0.05 3 = 0.1 V 5 0.15 = 0.5 V V = 0.3 L Converting to mL: Volume = 0.3 1000 = 300 mL . Answer: 300