Soaps cannot be used in hard water because they:

contain sodium

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form precipitates

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create environmental problems

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create ozone depletion

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Solution

The correct option is C form precipitates
Soaps cannot be used in hard water because they forms precipitates. When soaps are used in hard water that contains a lot of calcium and magnesium ions they cause the soap to precipitate and it is unable to form lather. This can be minimized by the addition of chemicals like sodium trimetaphosphate, borax, sodium silicate etc. These prevent the calcium and magnesium ions from reacting with the soap and allow it to form lather, thus forming precipitates.

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