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Unit - 8.2 Water of Crystallisation and Reaction of metals with Water — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYUnit - 8.2 Water of Crystallisation and Reaction of metals with Water2 Marks
Question
How can you remove permanent hardness of water? Write relevant chemical equation in support of your answer
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Answer

The presence of magnesium and calcium carbonates in water makes it temporarily hard. Hardness of water can be removed by boiling the water. When we boil the water the soluble salts of Mg(HCO3)2 is converted to Mg(OH)2 which is insoluble and hence gets precipitated and is removed. To remove hardness by boiling the bicarbonates changes to insoluble carbonate and water becomes soft.

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