What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10^-⁹ M hydroxide ion?

Name: What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10 - 9 M hydroxide ion?
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Question

Quizplus · Accepted Answer

The pH can be calculated using the formula pH = 14 - pOH. The pOH can be calculated using the given concentration of hydroxide ion, which is 3.98 × 10^-20 M, and the equation pOH = -log[OH^-]. 
pOH = -log(3.98 × 10^-20) = 19.40 
pH = 14 - 19.40 = 5.60 
Therefore, the answer is B.

What Is the PH of an Aqueous Solution at 25