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Acids in solution have a pH below 7.0, a sour taste, releases hydroxyl ions in water, and turn litmus paper red. Some examples are: Acetic Acid, Boric Acid, Carbonic Acid, Citric Acid.
Added 8/1/2014 10:21:34 AM
This answer has been confirmed as correct and helpful.
Confirmed by
selymi [8/3/2014 7:59:28 AM]