Question

4) (6 points) A 0.1278 g sample of primary standard Na2C2O4 is diluted to 100.00 mL with water and made slightly acidic before titration with a potassium permanganate solution of unknown concentration. The titration required exactly 33.31 mL of the potassium permanganate (KMnO4) solution.

a. Write and balance the Redox reaction in acidic solution.

b. Identify the oxidizing agent and the reducing agent on the left side of the reaction.

c. Calculate ΔEº=EºOx – EºRed . Is the reaction thermodynamically favored?

d. Calculate the equilibrium constant of the reaction.

e. Calculate the concentration of permanganate solution. MnO4- + H2C2O4 Mn2+ + CO2 Na2C2O4: 133.999 g/mol E° = 0.49 V for 2CO2(g) + 2H+(aq) + 2e− → H2C2O4(aq)