An additional 10 ml of water is evaporated from the solution because there is excess water in the solution which prevents the formation of crystals.
Crystallization is defined as a type of separation technique that is used for the separation of two salts with different solubilities
Alum, which is aluminum potassium sulfate, is a chemical compound that can be used for purification of water.
When dissolved in water it can be recovered through a process called recrystallization.
Recrystallization occurs when a solution of salt is concentrated by boiling off some of the solvents
When the quantity of the solvent can no longer hold all the salt, crystals will be formed.
Therefore, if crystals do not form upon cooling the solution of alum, the solution should still be heated to evaporate excess water in the solution which prevents the formation of crystals.
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Additional 10 ml of water is evaporated from the solution in order to formed alum.
If crystals do not form upon cooling the solution of alum, an additional 10 ml of water is evaporated from the solution because specific amount of water is needed for the formation of alum crystals. Alum crystal has 12 molecules of water so lower from 12 molecules of water or higher can leads to non-formation of alum crystal.
In the solution water is present in a very large amount which can evaporated with the help of heating until 12 molecules of water are present in the composition of alum so we can conclude that additional 10 ml of water is evaporated from the solution in order to produce alum.
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