How many molecules of water of crystallisation (per formula unit) are present in:
(a) copper sulphate crystals?
(b) washing soda?
(c) gypsum?

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Solution

a) Copper sulphate crystals contain five molecules of crystallisation in one formula unit. The chemical formula is CuSO₄.5H₂O (copper sulphate pentahydrate) .
b) Washing soda crystals (sodium carbonate crystals) contain 10 molecules of crystallisation in one formula unit. The chemical formula is Na₂CO₃.10H₂O (sodium carbonate decahydrate).
c) Gypsum (calcium sulphate crystals) contains two molecules of water of crystallisation in one formula unit. The chemical formula is CaSO₄.2H₂O (calcium sulphate dihydrate).

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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 ?

The number of molecules of water of crystallisation present in washing soda crystals is :

(a) five

(b) two

(d) seven

C u {S O}_{4}

5 H_{2} O

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

10 H_{2} O

C a {S O}_{4}

2 H_{2} O

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