## Chemistry 9th Edition

An Arrhenius acid is a substance which produces $H^+$ ions when dissolved in an aqueous solution. A Bronsted-Lowery acid is a substance which donates protons in solution. A Lewis acid is a substance which accepts electron-pairs. The Lewis acid is the most general.
Arrhenius Acid Reaction: $HCl \Rightarrow H^+ + Cl^-$ Bronsted-Lowry Acid Reaction: $HCl+H_2O\Rightarrow H_3O^++Cl^-$ Lewis Acid Reaction: $Ni^{2+}_{(aq)}+6NH_{3(aq)}\Rightarrow Ni(NH_2)_{6(aq)}^{2+}$