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What are the causes of hardness in water?

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What are the causes of hardness in water?

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Answer. Causes of hardness in water are presence of salts of divalent cations like Mg2+, Ca2+, and anions like Cl, SO42-, HCO3- and CO32- for example, gypsum (CaSO4.2H2O) and limestone (CaCO3) in water.
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