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Why does hard water not from lather wit...

Why does hard water not from lather with soap ?

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Hard water contains salts of calcium and magnesium ions. Hard water does not given lather with soap and froms scum/precipate with soap. Soap containing sodium stearte `(C_(17) H_(35) COONa)` reacts with hard water to precipitale out as `Ca//Mg` stearted.
`2C_(17)H_(35)COONa (aq) + M^(2+) (aq) to (C_(17)H_(35)COO)_(2) darr +2Na^(+) (aq)`
It is therefore, unsuitable for laundry.
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