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Structure and Reactivity : Acidity and Basicity

For example, in the self-ionization of water we see that two water molecules collide to react and form a hydroxide ion and a hydronium ion. Each reaction begins first by an electrostatic attraction between an electron rich and an electron poor region of the reactants. Hydrogen bonding occurs between the electron deficient hydrogen of one water molecule with the electron rich oxygen of another water molecule. The products form as the electron from one O-H bond becomes a lone pair on oxygen. Additionally the lone pair on the oxygen of another water molecule becomes shared in a new O-H covalent bond.