Answer is: more H⁺ ions than OH⁻ ions.
An Arrhenius acid is a
substance that dissociates in water to form hydrogen ions or
protons.
For example, hydrochloric acid dissociate in aqueous
solution to form hydrogen ions (H⁺)
and chloride anion (Cl⁻):
HCl(aq) → H⁺(aq) + Cl⁻
(aq).
An Arrhenius base is a
substance that dissociates in water to form hydroxide ions (OH⁻).
For example lithium hydroxide is an Arrhenius base:
LiOH(aq) → Li⁺(aq) + OH⁻(aq).
