Separating insoluble solid from solution via filtration

Steps:

• The reaction produces aqueous copper(II) sulfate solution with excess insoluble copper(II) oxide solid.
• Stirring ensures reaction completion, leaving undissolved oxide particles.
• Filtration removes the solid residue from the liquid filtrate.
• The clear filtrate contains the pure aqueous copper(II) sulfate.

Why C is correct:

• Filtration uses a filter funnel and paper to separate insoluble solids from liquids, as the pores trap solid particles while allowing the solution to pass through.

Why the others are wrong:

• A: A burette dispenses precise volumes of liquid in titrations, not for separating solids.
• B: Distillation apparatus separates liquids by boiling point differences, unsuitable for solid-liquid mixtures.
• D: A measuring cylinder measures liquid volumes, not for separation.

Final answer: C