What happens to the [OH⁻] of a solution when the [H₃O⁺] is increased? Decreased?
a) [OH⁻] increases; [H₃O⁺] decreases
b) [OH⁻] decreases; [H₃O⁺] increases
c) Both [OH⁻] and [H₃O⁺] increase
d) Both [OH⁻] and [H₃O⁺] decrease