Question

A teacher drops a bottle containing sodium chloride. The bottle breaks when it
hits the floor. The teacher sweeps up the mixture of sodium chloride and glass.
Describe how the teacher can obtain a pure, dry sample of sodium chloride from
the mixture.

Answer 1

The mixture of sodium chloride and broken glasses can be separated by dissolution, filtration, and evaporation respectively.

Separation of mixture

The mixture containing sodium chloride and broken glasses can be separated as follos:

• First, by dissolving the mixture in water. The soluble sodium chloride will dissolve while the broken glasses will remain insoluble.

• Filteration is carried out to filter off the broken glasses

• The filtrate which is now a mixture of water and sodium chloride can then be heated to evaporate off the water and to obtain dry sodium chloride.

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