In an Aqueous Solution, [H₃O⁺] Is 2

Multiple Choice

In an aqueous solution, [H₃O⁺] is 2.0 × 10⁻⁶ M. What is [OH⁻]?

A) 5.0 × 10⁻⁹ M
B) 1.0 × 10⁻⁷ M
C) 2.0 × 10^{− 6} M
D) 1.0 × 10⁸ M