How can I calculate pH of $NaOH$ ?

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Answer 1 · 2014-12-05T23:50:38

Assuming that you either start with, or can determine a molar concentration for $NaOH$ , the easiest way to get to $pH$ is by calculating $pOH$ .

$NaOH$ is a strong base, which means it dissociates completely

$NaOH(aq) + H_2O(aq) <=> Na^+ (aq) + OH^(-) (aq)$

The concentrations of $Na^+$ and $OH^-$ are equal to the intial concentration of $NaOH$ , let's say $X$ . You can now determine $pOH$ by using

$pOH = -log(X)$ , which then gets you to

$pH = 14 - pOH$

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