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Write equations to represent the ionization of HI as an acid in both
the Arrhenius and Brønsted-Lowry theories.
HI is a strong acid, so will ionize completely.
In Arrhenius theory, the acid dissociates into a hydrogen ion and the anion. For HI, then:
HI(aq) H+(aq) + I(aq)
In Brønsted-Lowry theory, the acid is a hydrogen ion donor and another species is required to act as the hydrogen ion acceptor. In aqueous solution, the hydrogen ion acceptor is water, so:
HI(aq) + H2O(l) H3O+(aq) + I(aq)