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I noticed that mineral water with high mineralization doesn't have salt flakes floating on the bottom of the bottle on store shelves, but when I open one, after some time they start accumulating. Does it have something to do with decarbonation?

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http://en.wikipedia.org/wiki/Solubility

Salt solubility decreases with decreasing pressure.

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It could be gases (oxygen or carbon dioxide) from the air, competing as solvents with the salts. I know the reverse effect: adding salt tends to drive out gases.

I'm not sure whether this gas explanation is more significant than the pressure explanation. But, you could do an experiment: briefly let the pressure out and then retighten the cap without letting fresh air enter, and see if the crystals still form.

  • They do, since the pressure falls. – user1306322 Oct 24 '13 at 6:32

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