Question

What is hard water? What are the salts that cause hardness towater?

Answer 1

Water that contains salts of calcium and magnesium principally as bicarbonates, chlorides, and sulphates is called Hard water ... .
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Answer 2

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Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. Some materials (e.g. metals) are harder than others (e.g. plastics, wood).

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