20.0 mL of an oxalic acid solution needs 22.4 mL of 0.0200 M KMnO4 in hot dilute H2SO4 (H2C2O4 oxidised to CO2). The molarity of the oxalic acid is

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$20.0 mL$ of an oxalic acid solution needs $22.4 mL$ of $0.0200 M$ $KMnO X_{4}$ in hot dilute $H X_{2} SO X_{4}$ ( $H X_{2} C X_{2} O X_{4}$ oxidised to $CO X_{2}$ ). The molarity of the oxalic acid is

2 MnO4- + 5 H2C2O4: mol oxalic acid = 2.5 x mol KMnO4 = 2.5 x (22.4/1000 x 0.0200) = 1.120e-03 mol. Molarity = 1.120e-03/0.0200 = 0.056 M.