Why do soaps not work in hard water?

Solution

Hard water contains calcium and magnesium ions. These ions form insoluble calcium and magnesium soaps respectively when soaps are dissolved in hard water.

stack 2 straight C subscript 17 straight H subscript 35 COONa with Soap below space plus space stack C a C l subscript 2 with left parenthesis i n space h a r d space w a t e r right parenthesis below space space space rightwards arrow space space space stack 2 NaCl space plus space left parenthesis straight C subscript 17 straight H subscript 35 COO right parenthesis subscript 2 Ca with Insoluble space calcium space stearate space left parenthesis Soap right parenthesis below

These insoluble soaps separate as scum in water and are useless as cleansing agent. Therefore, soaps are not work in hard water.

Some More Questions From Chemistry in Everyday Life Chapter

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Chemistry In Everyday Life

Why do soaps not work in hard water?

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