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 $$K_{w} = \left[ H^{+}_{(aq)} \right] \left[OH^{-}_{(aq)} \right]$$ It follows automatically that, when $$K_{W} = 1.0 \cdot 10^{-14}$$, $$pH + pOH = 14$$, and more general: $$pH + pOH = pK_{W}$$