Give one word for the following:
Water that forms lather with soap is called .

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Solution

Soap consists of sodium salt which does not dissolve easily with hard water. Soft water refers to water that has a lower concentration of dissolved calcium and magnesium ions. Due to the presence of a lower concentration of calcium and magnesium ions sodium salt, present in the soap gets easily dissolved and does not form any precipitate or soap scum.
Water that forms lather with soap is called soft water.

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Water that does not give lather with soap is water ______________ (hard water/soft water ).

Hard water easily forms lather with soap.

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