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Preparations and Uses of Sodium Carbonate

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Question

What happens when crystals of washing soda are exposed to air?

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Solution

Washing soda undergoes efflorescence and as a result loses nine molecules of water to form white powder

$N a_{2} C O_{3} \cdot 10 H 2 O \to N a_{2} C O_{3} . H_{2} O + 9 H_{2} O$

Washing soda Washing powder

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