Question

How will you separate a mixture of sodium chloride and sand ?

Answer 1

Two processes are involved in separation of sodium chloride and sand, i.e., filtration followed by evaporation. The mixture of sodium chloride and sand can be separated by the following method:

• Take the mixture of sodium chloride and sand in a china dish. Pour some water in the mixture of sodium chloride and sand.
• After few seconds, all the sodium chloride will dissolve in water but sand will not.
• Then pour the contents of the container in a funnel fitted with a filter paper.
• Sand remains on the paper as residue and sodium chloride dissolved in water passes through it to the funnel.
• Now put the salt solution of the funnel on heat. Water starts getting evaporated leaving salt as residue in the funnel.
• Remove the funnel from heat.