The hydronium ion concentration in an aqueous solution of is 2.0 * 10^-4 M at 25°C. The hydroxide ion concentration in the solution is

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Question

The hydronium ion concentration in an aqueous solution of $H_2SO_4$ is 2.0 * 10^-4 M at 25°C. The hydroxide ion concentration in the solution is

Prashant Kotian · Accepted Answer

Correct answer: D. At 25°C, Kw = [H3O+][OH-] = 1.0 * 10^-14 M^2. Given [H3O+] = 2.0 * 10^-4 M, [OH-] = Kw / [H3O+] = 1.0 * 10^-14 / (2.0 * 10^-4) = 5.0 * 10^-11 M.

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