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How addition of Na2CO3 removes permanent hardness of water?

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Answer. The addition of washing soda removes the calcium and magnesium ions as the insoluble calcium and magnesium carbonates, respectively. As a result permanent hardness of water removes.
Na2CO3(aq) + CaSO4(aq)         CaCO3(s) + NaSO4(aq)
Na2CO3(aq) + MgSO4(aq)        MgCO3(s) + Na2SO4(aq)
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