What is the concentration of hydroxyl ions in a solution of pH $8$ ?

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Answer 1 · 2018-02-05T21:45:01

$10^(-6)$ mol per litre

$pH$ is $-log_10$ of the hydrogen ion concentration (actually hydronium $H_3O^+$ concentration).

$pOH$ is $-log_10$ of the hydroxyl ( $OH^-$ ) ion concentration.

To say $pH + pOH = 14$ is to say that the product of the $H_3O^+$ and $OH^-$ ion concentrations is $10^-14$ .

If a solution has $pH = 8$ , then its $pOH$ is $14-8 = 6$ and the corresponding concentration of hydroxyl $OH^-$ ions is $10^(-6)$ mol per litre.

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