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Hard water   /hɑrd wˈɔtər/   Listen
Hard water

noun
1.
Water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap.  Antonym: soft water.





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"Hard water" Quotes from Famous Books



... extent in sea-water, but many of them in extremely minute quantities. Sodium and magnesium salts are the two most abundant, and the bitter taste is due to MgSO4 and MgCl2. A liter of sea- water, nearly 1000 g., holds over 37 g. of various salts, 29 of which are NaCl. See Hard Water. ...
— An Introduction to Chemical Science • R.P. Williams


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