What is the hydroxide ion concentration in an aqueous solution when the hydronium ion concentration equals 1 × moles per liter?

Question

What is the hydroxide ion concentration in an aqueous solution when the hydronium ion concentration equals 1 ×  moles per liter?

Quizplus · Accepted Answer

In water, the concentration of hydronium ions and hydroxide ions are inversely proportional to each other (pH + pOH = 14). Therefore, we can use this relationship to determine the concentration of hydroxide ions as follows:

pH + pOH = 14
Given pH = -log[H3O+] = -log(1 × 10^-11) = 11
pOH = 14 - pH = 14 - 11 = 3
[OH-] = 10^-pOH = 10^-3 = 1 × 10^-3 = 1 × 11ea82ef_47bf_5f07_aa40_5923a7621c9c_TB6000_11 moles per liter.

Therefore, the best choice is B.

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