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acidic solution contains more hydrogen ions than hydroxide ions basic solution contains more hydroxide ions than hydrogen ions Arrhenius model states that an acid is a substance that contains hydrogen and ionizes to produce hydrogen ions in aqueous solution Bronsted - Lowry model a model of acids and bases in which an acid is a hydrogen-ion donor and a base is a hydrogen-ion acceptor conjugate acid the species produced when a base accepts a hydrogen ion from an acid conjugate base the species produced when an acid donates a hydrogen ion to a base conjugate acid-base pair consists of two substances related to each other by the donating and accepting of a single hydrogen ion amphoteric describes water and other substances that can act as both acids and bases strong acid an acid that ionizes completely in aqueous solution strong base a base that dissociates entirely into metal ions and hydroxide ions in aqueous solution weak base a base that ionizes only partially in dilute aqueous solution to form the conjugate acid of the base and hydroxide ion pH the negative logarithm of the hydrogen ion concentration of a solution pOH the negative logarithm of the hydroxide ion concentration of a solution naturalization reaction a reaction in which an acid and a base react in aqueous solution to produce a salt and water salt an ionic compound made up of a cation from a base and an anion from an acid equivalence point the stoichiometric point of a titration end point the point at which the indicator that is used in a titration changes color buffer a solution that resists changes changes in pH when limited amounts of acid or base are added buffer capacity the amount of heat required to raise the temperature of one gram of pure water by one degree Celsius