Question

(a) Describe an activity to separate the crystals of alum from its impure sample.
(b) Name the technique and give an application of alum in your day to day life. ​

Answer 1

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Explanation:

(a) (i) Take some (approximately 5 g) impure sample of alum in a china dish.

(ii) Dissolve it in minimum amount of water.

(iii)Filter the impurities out.

(iv) Evaporate water from the alum solution so as to get a saturated solution.

(v) Cover the solution with a filter paper and leave it undisturbed at room temperature to cool slowly for a day. (vi) You will obtain the crystals of alum in the China dish.

This process is called crystallization.

(b) Application : Purification of water (loading). Antiseptic (after shave) .