1.

Why does hard water not from lather with soap ?

Answer» Hard water conatins `Ca^(2+) and Mg^(2+)` ions which of the soap to froms corresponding calcium and magnesium salts that are insoluble and get precipitated. Therefore, soap is simpluy wasterd without producing any lather.
`underset("Soap")(2RCOONA)+underset("(Hard water")(Ca^(2+))tounderset("(ppt)")((RCOO)_(2))Ca+2Na^(+)`
`underset("Soap")(2RCOONa)+underset("(Hard water)")(Mg^(2))tounderset("(ppt)")((RCOO)_(2))Mg+2Na^(+)`


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