Activity 2.9 NCERT Class 9 Science Is Matter Around Us Pure

Activity 2.9 NCERT Class 9 Science Chapter 2 Is Matter Around Us Pure

Brief Procedure:

Activity 2.8 wants us to separate impurity from copper sulphate by heating its solution.

Observation:

Pure Copper sulphate forms as a crystal.

Explanation:
Activity 2.8 NCERT Class 9 Science
Crystals of blue vitriol.

Crystallisation is a property of some salts. In an over-saturated solution of the salt, molecules of salt join to form small clusters. These small clusters have a fix molecular arrangement. We call such clusters as crystals.

Here we heat a solution of copper sulphate. Heating produces a saturated solution of the salt. When this solution cool, oversaturation results in the formation of copper sulphate crystals. Molecules of a crystal do not contain any impurity. As a result, we get pure copper sulphate.

Next: Difference between a mixture and a compound, Activity 2.10.

See also: Separation of mixtures by distillation, Activity 2.8

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