Calculate the hydronium ion concentration in an aqueous solution with a pOH of 9.85 at 25°C. A) 7.1 × 10^-5 M B) 4.2 × 10^-10 M C) 8.7 × 10^-10 M D) 6.5 × 10^-5 M E) 1.4 × 10^-10 M

Question

Quizplus · Accepted Answer

At 25°C, the sum of the pH and pOH of an aqueous solution is always 14. Given a pOH of 9.85, the pH is 14 - 9.85 = 4.15. The hydronium ion concentration, [H3O+], can be found using the formula [H3O+] = 10^-pH. Therefore, [H3O+] = 10^-4.15 = 7.1 × 10^-5 M.

Calculate the Hydronium Ion Concentration in an Aqueous Solution with a POH