Why does hard water not form lather with...

Why does hard water not form lather with soap ?

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Soap reacts with hard water to form scum acts to remove the hardness of water. So, lather is not form with hard water and soap.

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In which test tube do you get more foam ?
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In which test tube do you observe a why curdy precipitate ?
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What is hard water ?
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Why does hard water not form lather with soap ?
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Name one pure form of water present nature.
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What is scum ?
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