Name the compound which is obtained from baking soda and is used to remove permanent hardness of water. (ii) write its chemical formula. (iii) what happens when it is recrystallised from its aqueous solution ?
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permanent hadness ca be removed by treating the water with sodium carbonate . it react with chloride or sulphate or calcium or magnesium to form their respective insolubel carbonate which can be filtered out and water became soft
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