Calculate the Hydronium Ion Concentration in an Aqueous Solution That

Multiple Choice

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10^-6 mol L^-1 in hydroxide ion.

A) 4.00 × 10^-7 mol L^-1
B) 4.00 × 10^-8 mol L^-1
C) 4.00 × 10^-9 mol L^-1
D) 5.00 × 10^-9 mol L^-1