Calculate the hydroxide ion concentration in an aqueous solution with a pH of 4.33 at 25°C. A) 2.1 × 10^-10 M B) 9.7 × 10^-10M C) 4.7 × 10^-5 M D) 3.8 × 10^-5 M E) 6.3 × 10^-6 M

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Quizplus · Accepted Answer

The hydroxide ion concentration [$\text{OH}^-$] in an aqueous solution can be calculated using the relationship between pH, pOH, and the ion product of water ($K_w$) at 25°C, where $K_w = 1.0 \times 10^{-14}$. Given a pH of 4.33, the pOH can be found as $14 - 4.33 = 9.67$. The concentration of $\text{OH}^-$ is then $10^{-\text{pOH}} = 10^{-9.67} \approx 2.1 \times 10^{-10} \, M$.

Calculate the Hydroxide Ion Concentration in an Aqueous Solution with a PH