In a basic solution at 25°C,
a. [H₃O⁺] > [OH⁻].
b. [H₃O⁺][OH⁻] <1.0 x 10⁻¹⁴,
c. [H₃O⁺][OH⁻]> 1.0 x 10⁻¹⁴.
d. [OH⁻] > 1.0 x 10⁻⁷.
e. [H₃O⁺] > 1.0 x 10⁻⁷.