What Is the Hydronium Ion Concentration, [H₃O⁺], of an Aqueous

Multiple Choice

What is the hydronium ion concentration, [H₃O⁺], of an aqueous 0.083 M hydroxylamine, HONH₂, solution?
Hydroxylamine is a basic substance when dissolved in water. K _b(HONH₂) = 1.1×10 ^{- 8}

A) [H₃O⁺] = 1.2×10 ^{- 13} M
B) [H₃O⁺] = 3.6×10 ^{- 11} M
C) [H₃O⁺] = 3.3×10 ^{- 10} M
D) [H₃O⁺] = 3.0×10 ^{- 5} M
E) [H₃O⁺] = 2.8×10 ^{- 4} M