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Calcium Hydroxide cannot be used to remo...

Calcium Hydroxide cannot be used to remove permanent hardness of water why?

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`MgCl_2+Ca(OH)_2toMg(OH)_2+CaCl_2` Removal of permanent hardness means (Mg &Ca) chlorides and sulphates are converted to insoluble carbonates but we can use `Ca(OH)_2` means formed calcium chlorides only does not form insoluble carbonates
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