What is the ion-product constant, $K_{w}$ $K_w$ ?

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What is the ion-product constant, $K_{w}$ $K_w$ ?

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Answer 1 · 2017-06-11T19:50:27

For water, this is the measure of the $autoprotolysis reaction$ $"autoprotolysis reaction"$ ....

Explanation:

$2 H_{2} O (l) ⇌ H_{3} O^{+} + H O^{-}$ $2H_2O(l) rightleftharpoonsH_3O^+ + HO^-$

And $K_{w} = [H O^{-}] [H_{3} O^{+}] = 10^{- 14}$ $K_w=[HO^-][H_3O^+]=10^-14$ at $298 \cdot K$ $298*K$ .

And when we take $- {log}_{10}$ $-log_10$ of both sides we get the useful expression...........

$p H + p O H = 14$ $pH+pOH=14$ , where $p H = - {log}_{10} [H_{3} O^{+}]$ $pH=-log_10[H_3O^+]$ etc.

How do you think $K_{w}$ $K_w$ would develop if non-standard conditions pertained; e.g. if temperature was say $373 \cdot K$ $373*K$ . Would $K_{w}$ $K_w$ remain constant, decrease, increase? Remember that the autoprotolysis reaction as shown is a $bond-breaking reaction$ $"bond-breaking reaction"$ .

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What is the ion-product constant, $K_{w}$ $K_w$ ?

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