Question

Name the ions whose presence makes the water hard ?

Answer 1

1.)Hardness in water is caused by dissolved magnesium and calcium ions.

2.) These make it more difficult for the water to form a lather with soap.

3.) Temporary hardness is caused by dissolved calcium hydrogen carbonate (which is removed by boiling).

4.) Temporary hardness is due to hydrogen-carbonates of calcium and magnesium.

Answer 2

The ions are calcium and magnesium
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