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How to know the amount of water molecules present in one formula unit of copper sulphate crystals. How to find out amount of water molecules in other crystals.

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Solution

Water of crystallisation is the fixed number of water molecule present in the one formula unit of a salt. One formula unit of copper sulphate contains five water molecule.
When the hydrated salt is heated they lose the water molecule. From the difference in weight of the hydrated and anhydrated the number of water molecule is calculated.
Weight of the hydrated salt = x g
Weight of the anhydrated salt= y g
Difference in weight = x-y gm
No of water molecule = x-y /18

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Similar questions

How many molecules of water of crystallisation (per formula unit) are present in :

(a) copper sulphate crystals ?

(b) washing soda ?

(c) gypsum ?

Q. Copper sulphate crystals which seem to be dry contain water of crystallization. When we heat the crystals, this water is removed and the salt turns white. If you moisten the crystals again with water, you will find that blue colour of the crystals reappears.

The water of crystallization is the fixed number of water molecules present in one formula unit of a salt. Five water molecules are present in one formula unit of copper sulphate. The chemical formula for hydrated copper sulphate is

C u {S O}_{4}

5 H_{2} O

. Now you would be able to answer the question whether the molecule of

{N a}_{2} {C O}_{3}

10 H_{2} O

is wet. One other salt, which possesses water of crystallization is gypsum. It has two water molecules as a water of crystallization. It has the formula

C a {S O}_{4}

2 H_{2} O

What are the uses of this salt?

Q. How many molecules of water are present in one formula unit of copper sulphate pentahydrate?

Q. How many water molecules are present in one formula unit of

{CuSO}_{4} . 5 H_{2} O

?

Q. If compound X is

C u S O_{4} . 5 H_{2} O

, how many water molecules are present in one formula unit of X?

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