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