When water ionizes, which ions are produced?

Identify the ions produced: the hydronium ion (\(\mathrm{H_3O^+}\)), which is a water molecule with an extra proton, and the hydroxide ion (\(\mathrm{OH^-}\)), which is water that has lost a proton.

Note that \(\mathrm{Na^+}\) and \(\mathrm{Cl^-}\) are ions from common salts, not from water ionization, and \(\mathrm{H_2O^+}\) and \(\mathrm{O^{2-}}\) are not typical ions formed in water ionization.