A chemist needs to prepare a supersaturated solution of sodium acetate for an experiment. Which of the following procedures should they follow?

• A. Dissolve sodium acetate in water at room temperature until no more dissolves.
• B. Evaporate some water from a saturated solution at room temperature.
• C. Add sodium acetate to cold water and stir continuously.
• D. Heat the solution, dissolve excess sodium acetate, then cool it slowly.

Answer: (D)