Are there hydroxide ions in a solution of pH 0?


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  • $\begingroup$ You mean pH 0? Yes, of course. $\endgroup$ – Karl Aug 19 '18 at 12:45
  • 1
    $\begingroup$ Yes, but very few. $\endgroup$ – 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.


Yes -- assuming you mean an aqueous solution.

In an aqueous solution there are always some hydroxide ions present, but if the pH is very low, there will be very few. The relationship is:

$\ce{[H^+][OH^-] = 10^{-14}}$

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.


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