Question

Hard water : Sodium salt :: Soft water : ………………​

Answer 1

Explanation:

The hardness of water is determined primarily by the amount of calcium and magnesium it contains. Higher levels of these and other minerals make water hard. ... Instead of having higher levels of calcium and magnesium, soft water tends to have higher concentrations of sodium, or salt.

Answer 2

Hope it is helpful

Explanation:

The hardness of water is determined primarily by the amount of calcium and magnesium it contains. Higher levels of these and other minerals make water hard. ... Instead of having higher levels of calcium and magnesium, soft water tends to have higher concentrations of sodium, or salt.