An HCl solution has a pH of 3.10. What is its [OH⁻]? A) 7.9 × 10⁻¹⁸ M B) 1.3 × 10⁻¹¹ M C) 7.9 × 10 ⁴ M D) 1.3 × 10³ M

Name: An HCl solution has a pH of 3.10. What is its [OH − ]? A) 7.9 × 10 −18 M B) 1.3 × 10 −11 M C) 7.9 × 10 4 M D) 1.3 × 10 3 M
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Question

Quizplus · Accepted Answer

pH = -log[H+]
3.10 = -log[H+]
[H+] = 7.94 x 10^-4 M
[H+][OH-] = 1 x 10^-14 M^2 (at 25°C)
7.94 x 10^-4 M * [OH-] = 1 x 10^-14 M^2
[OH-] = 1.262 x 10^-11 M
Therefore, the answer is B: 1.3 x 10^-11 M.

An HCl Solution Has a PH of 3