When crystals of washing soda are left open in air, they lose:

nine molecules of water of crystallisation

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five molecules of water of crystallisation

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three molecules of water of crystallisation

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ten molecules of water of crystallisation

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Solution

The correct option is D nine molecules of water of crystallisation
Sodium carbonate crystallizes from water as decahydrate. It effloresces on exposure to dry air forming the monohydrate.

$N a_{2} C O_{3} \cdot 10 H_{2} O dry air - --- \to N a_{2} C O_{3} \cdot H_{2} O + 9 H_{2} O$

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Similar questions

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

(a) five

(b) two

(d) seven

When washing soda remove in open air the only nine molecules of water get evoporate rather ten.

N a_{2} C O_{3} . 10 H_{2} O e x p o s e d - --- \to t o a i r N a_{2} C O_{3} . H_{2} O + 9 H_{2} O

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

(a) copper sulphate crystals ?

(b) washing soda ?

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