Question

Acids contain _______ ions and bases contain ________ ions.

• A. ${\mathrm{H}}^{+}$
• B. ${\mathrm{OH}}^{-}$

Answer 1

Arrhenius acids and bases:

(1) The Arrhenius theory of acids and bases was originally proposed by the Swedish chemist Svante Arrhenius in 1884.

(2) An Arrhenius acid is any species that increases the concentration of H⁺ ions or protons in an aqueous solution.

(3) An Arrhenius base is defined as any species that increases the concentration of hydroxide ions OH^- ions.

(4) Arrhenius acid increases the concentration of H⁺ ions.

(5) An Arrhenius base increases the concentration of OH^- ions.

(6) In an acid-base or neutralization reaction, an Arrhenius acid and base usually react to form water and salt.

Therefore, acids contain H⁺ ions and bases contain OH^- ions.