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Soap forms lather with soft water but does not form lather with hard water. Why? |
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Answer» Solution :HARD water forms scum/precipitate with SOAP. Soap containing SODIUM stearate `(C_(17)H_(35)COONA)` reacts with hard water to precipitate out Ca/Mg stearate. `2C_(17)H_(35)COONa_((AQ))+M_((aq))^(2+)to` `(C_(17)H_(35)COO)Mdownarrow+2Na_((aq))^+` ,M is Ca/Mg It is, therefore, unsuitable for laundry. |
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