Question

Sakng place and the tests for the gaseous products.
8. A mixture consists of sand and common salt. Briefly describe the experimental procedure for calculating
the %age of sand.​

Answer 1

Answer:

MATERIALS REQUIRED

Sand, common salt (NaCl), ammonium chloride (NH4Cl) or camphor, filter paper, funnel, china dish, tripod stand, wire gauze, beaker, glass rod, burner, cotton plug.

THEORY

In a mixture, the components retain their properties and can therefore, be separated by physical methods based upon their properties.

Camphor and ammonium chloride on heating directly convert into vapour. This is called sublimation. In contrast to this, sand and common salt do not sublime. So from a mixture, containing ammonium chloride (or camphor), common salt and sand, ammonium chloride (or camphor) can be easily separated by the process of sublimation. On heating ammonium chloride (or camphor) converts into vapour leaving behind the non-volatile components. On cooling the vapour of ammonium chloride (or camphor) changes into solid.

cbse-class-9-science-practical-skills-separation-of-mixture-1

Common salt is soluble in water but sand is not soluble in water.

When a mixture of common salt and sand in water is passed through filter paper, sand particle remain on the filter paper but other components of mixture i.e., common salt and water pass through filter paper.

From a solution of common salt in water, common salt can be obtained by evaporation.

For separation of different components of a mixture of ammonium chloride (or camphor) common salt and sand, methods of sublimation, Alteration and evaporation are applied.

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