Hydrogen Ions and Acidity. The Ionization of Water and pH. Hydrogen Ions in Water. We are used to thinking of water as a pure liquid that contains only H 2 O molecules. However, as a pure liquid, water ionizes into hydrogen ions and hydroxide ions: H 2 O( l ) → H + ( aq ) + OH - ( aq )
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Colas are slightly acidic. If a cola solution has [H+] = 1.0×10-5 M, what is the [OH-]?
[H+] = 1.0×10-5 M
Kw = [H+][OH-] = 1.0×10-14
Kw = [H+][OH-]
[OH-] = 1.0×10-9