Question

How will you separate the following mixtures? Name the methods that can be used.

CaCO₃ and NaCl

Answer 1

Separation of CaCO₃ from NaCl :

• CaCO₃ (Calcium carbonate) is insoluble in water while NaCl (Sodium chloride) is soluble in water. So, when we add water to this mixture, NaCl dissolves in water.
• The solution is then subjected to filtration and CaCO₃ being insoluble remains on the pores of filter paper and is separated from the NaCl solution.
• The salt (NaCl) solution is then made to undergo evaporation and due to this, the water molecules vaporize, and NaCl is left behind.
• Hence, CaCO₃ can be separated by filtration, and NaCl solution can be separated by evaporation.