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Question

What happens when crystals of washing soda are left open in dry air?what is this change named as? 
 


Solution

Washing soda(Na2CO3.10H20) when is left open in the dry air, lose its water of crystallization.This change is named as efflorescence.

1. It is used in making of glass and soap.

2. It is used for removing permanent hardness of water.

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