Separating insoluble solid from solution

Steps:

• Identify the mixture as excess solid copper(II) oxide in aqueous copper(II) sulfate solution.
• Select filtration to separate the insoluble solid from the liquid.
• Use filter funnel and paper to trap the solid while allowing the solution to pass through.
• Collect the filtrate as the separated aqueous copper(II) sulfate.

Why C is correct:

• Filtration separates insoluble solids from liquids by passing the mixture through porous filter paper, which retains the solid particles (basic principle of heterogeneous mixture separation).

Why the others are wrong:

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

Final answer: C