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Common Salt

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Question

what is the role of washing soda during softening of hard water?

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Solution

Washing soda remove the hardness producing sulphate, chlorides of calcium and Magnesium.
$N a_{2} C O_{3} . 10 H_{2} O \to N a_{2} C O_{3} + 10 H_{2} O N a_{2} C O_{3} + M g C l_{2} \to 2 N a C l + M g C O_{3}$

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