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Explain the formation of scum when hard ...

Explain the formation of scum when hard water is treated with soap.

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When soaps are mixed with hard water containing calcium and magnesium salts, soap molecules react with these salts and from an insoluble scum.
`Ca^(2+) + 2RCOONa to underset(["Calcium salt ppt."])([RCOO]_(2) Ca darr + 2Na^(+))` .
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