a) Add water to the mixture. Sodium chloride and barium chloride are soluble in water, while sand is insoluble. Stir the mixture until all the soluble components dissolve.

b) Filter the mixture using filter paper. The sand will be retained on the filter paper while the sodium chloride and barium chloride solution will pass through.

Step 2: Crystallization (for separating sodium chloride and barium chloride)

a) Heat the filtrate from step 1b to evaporate water and concentrate the solution. Continue heating until the solution reaches the saturation point, where no more sodium chloride or barium chloride can dissolve.

b) Allow the solution to cool slowly. As the solution cools, sodium chloride will start to crystallize out of the solution. Filter the mixture again to separate the sodium chloride crystals from the remaining solution.

Step 3: Precipitation (for separating barium chloride)

a) Add a precipitating agent, such as sulfuric acid, to the remaining solution from step 2b. Barium sulfate will form as a precipitate while sodium chloride will remain in the solution.

b) Filter the mixture to separate the barium sulfate precipitate from the sodium chloride solution.

The final products obtained are:

- Sand (insoluble component)

- Sodium chloride (NaCl, obtained from crystallization)

- Barium chloride (BaCl2, obtained from precipitation)