Question

what is hard water..

Answer 1

water which contains bicarbonates of calcium and
chlorides

Answer 2

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Hard water has large concentration of minerals, such as calcium or magnesium. When water is passed through materials such as limestone, it picks the minerals such as calcium and magnesium. Hard water is not suitable for washing clothes. as it does not lather well. It is also not suitable for dyeing and photography as it causes changes in the colours used. Hard water is not a good choice for use in boilers because it corrodes the metal. The salt gets deposited in the boilers, which may cause explosion due to building up of high pressure.

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