Q. 35 C5.0( 5 Votes )

Why is soap not suitable for washing clothes when the water is hard?

Answer :

Soap does not work properly when hard water is used. Hard water contains salt of calcium and magnesium. When soap is added with hard water, a large amount of soap in water reacts with the calcium and magnesium ions of hard water to form an insoluble precipitate called scum. This makes the cleaning of clothes difficult.

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