Autoprotolysis of water endo or exo?

[Ryan Narisma 4G]

Is the autoprotolysis of water an endothermic reaction or exothermic? The reaction forms an OH bond and is breaking an OH bond so is the change in enthalpy 0?

[Mitchell Koss 4G]

The autoionization of water is an endothermic reaction.

[Eileen Si 1G]

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.

[EMurphy_2L]

can someone elaborate on why this is endothermic? because a bond is both being formed and broken (exo and endo, respectively)...

[Tiffany_Chen 2K]

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.