# Does a solution of pH zero contain hydroxide ions? [closed]

Are there hydroxide ions in a solution of pH 0?

## closed as off-topic by a-cyclohexane-molecule, Mithoron, Jon Custer, A.K., Todd MinehardtAug 19 '18 at 20:07

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• You mean pH 0? Yes, of course. – Karl Aug 19 '18 at 12:45
• Yes, but very few. – Ivan Neretin Aug 19 '18 at 12:46

Yes. There are $10^{14}$ times as many $\ce{H+}$ as $\ce{OH-}$ in a solution of pH 0. From the formula $$K_w=\ce{[H+][OH-]}$$ you can see there will always be both $\ce{H+}$ and $\ce{OH-}$ in an aqueous solution regardless of the pH.
$\ce{[H^+][OH^-] = 10^{-14}}$
At pH = 0, $\ce{[H+] = 10^{-0} = 1}$ (by definition of pH), so $\ce{[OH^-] = 10^{-14}}$
$10^{-14}$ M is very, very low concentration -- but not none.