Question

what causes the hardness of water?​

Answer 1

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Hardness in water is caused by dissolved calcium and, to a lesser extent, magnesium. It is usually expressed as the equivalent quantity of calcium carbonate. Depending on pH and alkalinity, hardness above about 200 mg/l can result in scale deposition, particularly on heating.

Answer 2

In simple language when u mix it with detergent water becomes hard




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