Question

What is the reason for hardness of water?

Answer 1

Water contains many minerals and calcium, potassium. The water which is not as refined found in villages is hard water due to presence of excess minerals-Ca. This makes it hard to lather. On the other hand- distilled water is that which is boiled and has no minerals as ions.

Answer 2

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Hard water is water that has high mineral content (as opposed to "soft water"). Hard water is used to describe any water that contains mineral ions with a charge of +2. It is formed when water percolates through deposits of calcium and magnesium-containing minerals such as limestone, chalk and dolomite.

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