The Arrhenius Definition of Acids and Bases

• The H+ ions are highly reactive. In aqueous solution, they bond to water molecules according to the reaction.

The H3O+ ion is the hydronium ion.

• In water, H+ ions always associate with H2O molecules.
• Chemists often use H+(aq) and H3O+(aq)

interchangeably to refer to a hydronium ion.