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Question
Explain with equation, what is noticed when permanent hard water is treated with Washing soda.
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Solution
When washing soda or soda ash is added to hard water, the corresponding insoluble carbonates settle down and can be removed by filtration.
\[\ce{Ca(HCO3)2 + Na2CO3 ->[boil] CaCO3 \downarrow + 2NaHCO3}\]
\[\ce{Mg(HCO3)2 + Na2CO3 ->[boil] MgCO3 \downarrow + 2NaHCO3}\]
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