Design an experiment using a vacuum flask and Buckner funnel to separate a mixture of sand and water. What steps would you include?

• A. Attach the Buckner funnel to the vacuum flask, place filter paper in the funnel, and apply vacuum to draw water through.
• B. Stir the mixture vigorously to separate the sand.
• C. Heat the mixture in the vacuum flask to evaporate the water.
• D. Use a separatory funnel to separate the sand from the water.

Answer: (A)