What is the hydroxide concentration for a solution with a pH of 10 at 25 °C?

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Multiple Choice

What is the hydroxide concentration for a solution with a pH of 10 at 25 °C?

Explanation:
At 25 °C, pH and pOH add up to 14. A pH of 10 means pOH is 4. Since pOH is the negative logarithm of the hydroxide concentration, [OH−] = 10^−pOH = 10^−4 M. You can also check with Kw = [H+][OH−] = 1.0 × 10^−14; with pH 10, [H+] = 10^−10 M, so [OH−] = (1.0 × 10^−14) / (1.0 × 10^−10) = 1.0 × 10^−4 M. So the hydroxide concentration is 1.0 × 10^−4 M.

At 25 °C, pH and pOH add up to 14. A pH of 10 means pOH is 4. Since pOH is the negative logarithm of the hydroxide concentration, [OH−] = 10^−pOH = 10^−4 M. You can also check with Kw = [H+][OH−] = 1.0 × 10^−14; with pH 10, [H+] = 10^−10 M, so [OH−] = (1.0 × 10^−14) / (1.0 × 10^−10) = 1.0 × 10^−4 M. So the hydroxide concentration is 1.0 × 10^−4 M.

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