A sample of solid ethanedioic acid (H2C2O4.2H2O) has been contaminated with potassium ethanedioate (K2C2O4.xH2O). A 1.780 g sample of this mixture was made up to a 250 cm3 solution with distilled water. A 25 cm3 sample was titrated against 0.100 mol dm-3 sodium hydroxide, requiring 17.35 cm3. Another 25 cm3 sample was acidified with sulphuric acid and titrated against 0.0200 mol dm-3 KMnO4 solution, requiring 24.85 cm3. Calculate x.
C2O42- → 2CO2 + 2e-
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