Question

Define water of crystallisation. Give the chemical formula for two
compounds as examples. How can it be proved that the water of
crystallisation makes a difference in the state and colour of the
compounds ?

Answer 1

a) Two correct examples are:
Copper sulphate, chemical formula - CuSO­­4.5H2O

Washing soda, chemical formula - Na2CO3.10H2O

b) Water of crystallisation is the number of water molecules that combine chemically in definite molecular proportion, with the concerned salt in the crystalline state.

Mark the answer as the brainliest

Answer 2

The Water of crystallization with examples is explained below.

• Some chemicals are in the form of liquid whereas some are crystalline or are in powder form.
• The dry powder or crystal compounds aren't exactly dry and still have molecular water in their structure. This is known as the water of crystallisation.
• The water of crystallization or water of hydration is water molecules that are present inside the crystals. Water is often incorporated in the formation of crystals from aqueous solutions.
• Examples are $CuSO_{4}.5H_{2}O$ and $Na_{2}CO_{3}.10H_{2}O$.
• The proof can be given by heating the hydrated copper sulphate pentahydrate powder in a dry test tube by which we can see some water droplets on the inner surface of the tube.