A sample of solid ethanedioic acid (H₂C₂O₄·2H₂O) has been contaminated with potassium…
CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases
Problem
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.