a. Why is methanoic acid never prepared by refluxing methanol with acidified potassium dichromate(VI) solution?

b. Look back at the two half-equations for the oxidation of methanoic acid. Write two similar equations representing the oxidation of ethanedioic acid.

c. i. In a titration between ethanedioic acid and potassium manganate(VII) solutions, ethanedioic acid is heated in its conical flask before adding the potassium manganate(VII) solution from the burette. Suggest why.

ii. In an experiment to standardise a solution of potassium manganate(VII), 25.0 cm³ of a standard solution of 0.0500 mol dm^–3 ethanedioic acid was fully oxidised by a titre of 8.65 cm³ of potassium manganate(VII) solution. What was the concentration of the potassium manganate(VII) solution?