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# Solution: What is the Kw of pure water at 50 degrees C, if the pH is 6.630?

###### Problem

What is the Kw of pure water at 50 degrees C, if the pH is 6.630?

###### Solution

We’re being asked to determine the value of Kw for pure water at 50 ˚C given a pH of 6.630.

Recall that Kw is the autoionization constant of water, and is given by:

$\overline{){{\mathbf{K}}}_{{\mathbf{w}}}{\mathbf{=}}\left[{\mathbf{H}}^{\mathbf{+}}\right]\left[{\mathbf{OH}}^{\mathbf{-}}\right]}$

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