Question

Your teacher will provide you with a beaker containing a mixture of mung beans
talcum powder and common salt.
Mung beans
Talcum powder
Common salt​

Answer 1

Explanation:

Add mixture to a quantity of water sufficient to dissolve the salt. The salt will dissolve, the chalk powder will sink and the camphor will float as its density (0.99 gram/cm3) is slightly less than water’s and certainly less than that of salt water.

Using a fine sieve skim off the floating camphor and wash with distilled water on the same sieve. Place in a dust free place to dry.

Suspend the chalk in the salt water by stirring and pour through the same sieve or filter through filter paper if the chalk is too fine and wash the residue as above. Place in a dust free place to dry.

Pour the salt water into an evaporating dish and allow it to evaporate and crystallise.

This method uses the density properties of the substances only.

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