What do you mean by water of crystallisation? Give two examples of hydrated salts. How water of
crystallisation affect the state and colour of compounds? How would you show that copper sulphate
crystals contain water molecules of crystallisation?
Answers
Answer:
chemistry, water(s) of crystallization or water(s) of hydration are water molecules that are present inside crystals. Water is often incorporated in the formation of crystals from aqueous solutions.[1] In some contexts, water of crystallization is the total mass of water in a substance at a given temperature and is mostly present in a definite (stoichiometric) ratio. Classically, "water of crystallization" refers to water that is found in the crystalline framework of a metal complex or a salt, which is not directly bonded to the metal cation.
Upon crystallization from water or moist solvents, many compounds incorporate water molecules in their crystalline frameworks. Water of crystallization can generally be removed by heating a sample but the crystalline properties are often lost. For example, in the case of sodium chloride, the dihydrate is unstable at room temperature.
Answer:
Water of crystallization or the water of hydration is the water that occurs in the crystals. It is denoted as hydrated compound nH
2
O. For example, gypsum is a soft mass having the formula CaSO
4
.2H
2
O. On heating gypsum, plaster of paris is formed by losing the water of crystallization. Plaster of paris is a hard mass with the formula CaSO
4
.
2
1
H
2
O.