What are hydronium and hydroxide ions?
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Two water molecules will sometimes combine into hydronium and hydroxide ions. Pure water is considered to neutral and the hydronium ion concentration is 1.0 x 10-7 mol/L which is equal to thehydroxide ion concentration. So the pH is the -log of the [hydronium ion].
The hydronium ion is an important factor when dealing with chemical reactions that occur in aqueous solutions. Its concentration relative to hydroxide is a direct measure of the pH of a solution. It can be formed when an acid is present in water or simply in pure water.
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