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Adding onto what the previous person said, because the autoionization of water is an endothermic reaction, the change in enthalpy is positive, because endothermic reactions require heat, which causes the products to be more favored than the reactants.
If you think of the reverse reaction (2H2+O2->2H2O), energy is released to form the covalent bonds of water. Thus the reverse is exothermic, while the forward reaction (protonation of H2O) is endothermic.
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