A solution of permanganate is standardized by titration with oxalic acid (H2C2O4). It required 42.85 mL of 0.00751 M permanganate solution to react completely with 25.00 mL of oxalic acid solution. The unbalanced equation for the reaction in acidic solution is: MnO4 – (aq) + H2C2O4 (aq) ⟶ Mn2+ (aq) + CO2 (g) What is the molarity of the oxalic acid solution?

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A solution of permanganate is standardized by titration with oxalic acid (H2C2O4). It required 42.85 mL of 0.00751 M permanganate solution to react completely with 25.00 mL of oxalic acid solution. The unbalanced equation for the reaction in acidic solution is:

MnO4 – (aq) + H2C2O4 (aq) ⟶ Mn2+ (aq) + CO2 (g)

What is the molarity of the oxalic acid solution? 

Expert Solution
Step 1

The reaction can be balanced as follows:

5 H2C2O4 + 2 MnO4- + 6 H+ → 10 CO2 + 2 Mn2+ + 8 H2O

Given :

The volume of the permanganate solution=42.85 mL =0.04285 L 

Molarity of the permanganate solution=0.00751 M

The volume of oxalic acid=25.00 mL=0.025 L

Molarity of oxalic acid= y mol/L

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