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What ions are formed during self-ionization of water?

H₃O + and OH-

HO₂- and H₂O

OH + and H₃O-

All answers are correct

The self-ionization of water is an ionization reaction in pure water or in an aqueous solution, in which a water molecule, H2O, deprotonates to become a hydroxide ion, OH−. The hydrogen nucleus, H+, immediately protonates another water molecule to form hydronium, H3O+. It is an example of autoprotolysis, and exemplifies the amphoteric nature of water.

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Dolf Botha wikipedia → Self-ionization of water

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