The concentration of H₃O⁺ in a solution is 6 × 10^-4 M at 25°C.What is its hydroxide-ion concentration? A)6 × 10^-4 M B)1 × 10^-10 M C)2 × 10^-10 M D)3 × 10^-10 M E)2 × 10^-11 M

Question

Quizplus · Accepted Answer

The concentration of hydroxide ions can be calculated using the equation for the ionization of water: Kw = [H+][OH-] At 25°C, Kw = 1 × 10^-14 Since the concentration of H+ is not given in the question, we can assume that it is negligible compared to the concentration of H₃O⁺. Let x be the concentration of OH-. Then, Kw = [H+][OH-] = x^2 Solving for x, we get: x = square root of (Kw) = square root of (1 × 10^-14) = 1 × 10^-7 Therefore, the hydroxide-ion concentration is 1 × 10^-7 M or 10^-7 M. The closest choice to this value is E, 2 × 10^-11 M.

The Concentration of H3O+ in a Solution Is 6 ×

The Concentration of H₃O⁺ in a Solution Is 6 ×