Chemistry 5070 · O Level · Separation and purification

Separation and purification — practice question

Since sand does not dissolve in water, whereas sodium chloride does dissolve in water, a beaker containing $10.0\text{ g}$ of a sand and sodium chloride mixture is provided.
(main)[5]

Suggest an experiment to determine the percentage, by mass, of sodium chloride in the mixture. You should mention the apparatus needed, the measurements that must be taken, and how the results would be used to find the percentage, by mass, of sodium chloride in the mixture.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Add water to the mixture and stir or heat it until the sodium chloride dissolves” …

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI