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Hydronium is the protonated water molecule: H3O+

It is found in pure water formed by autoprotolysis, at concentration of 1.0*10-7 mol/L:

H2O + H2O <<--> H3O+ + OH-

That's why pH of pure water is 7.0 (= -log[H3O+] = -log(1.0*10-7)

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14y ago

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