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Topic: help???need a simple expl.  (Read 4200 times)

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Offline Bojanica

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help???need a simple expl.
« on: September 13, 2006, 02:07:43 PM »
  i have a question about soft and hard water.....I know that soap will not lather up easily in hard water,but any explanation why ???
it's my first time here,so be nice to me.... :)
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Offline Hispania

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Re: help???need a simple expl.
« Reply #1 on: September 13, 2006, 02:27:47 PM »
It depends on the concentration of Ca2+ and Mg2+.

The Ca2+ and Mg2+ salts of long chains fatty acids (soap) are not soluble in water, so they can´t form foam.

« Last Edit: September 13, 2006, 03:14:52 PM by Hispania »
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Offline kemometrik

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Re: help???need a simple expl.
« Reply #2 on: September 19, 2006, 09:53:40 AM »
Hard water contains a greater quantity of Ca2+ and Mg2+ ions. The reaction of the earth alkali ions with soap produces precipates
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