Problem: The ion-product constant for water, Kw, is 1.0 x 10 -14 at 25 oC and 3.8 x 10 -14 at 40 oC. Is the auto ionization of water endothermic or exothermic?

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The ion-product constant for water, Kw, is 1.0 x 10 -14 at 25 oC and 3.8 x 10 -14 at 40 oC. Is the auto ionization of water endothermic or exothermic?