JAMB - Chemistry (1978 - No. 38)
By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and?
potassium nitrate
sand
lead nitrate
sugar (glucose)
starch
Explication
Use enough water to completely submerge the sand-salt mixture. Stir or shake the mixture for a few minutes so that the salt dissolves in the water.
The sand is insoluble, so it will remain visible.