A volume of 20 ml of M KMnO₄ solution is diluted to 150 ml. In this solution, 50 ml of 10 M H₂SO₄ is added. 25 ml of this mixture is titrated with 20 ml of FeC₂O₄ solution. The molarity of FeC₂O₄ solu

Question

A volume of 20 ml of M KMnO₄ solution is diluted to 150 ml. In this solution, 50 ml of 10 M H₂SO₄ is added. 25 ml of this mixture is titrated with 20 ml of FeC₂O₄ solution. The molarity of FeC₂O₄ solution is

TestHub · Accepted Answer

Reading the printed "M KMnO₄" as 1 M (the book's own convention for a bare "M", as in "M - NaOH" elsewhere in this exercise): 20 ml holds 20 mmol KMnO₄; after dilution to 150 ml and addition of 50 ml acid (total 200 ml) it is 0.1 M. 25 ml of the mixture holds 2.5 mmol = 12.5 meq. FeC₂O₄ gives Fe²⁺ (1e⁻) + C₂O₄²⁻ (2e⁻), n = 3, so molarity = 12.5/(20 × 3) = 0.208 M, option (b).

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