What volume of 0.200 M potassium hydroxide should be added to 300. mL of 0.150 M propanoic acid (C₂H₅COOH) to obtain a solution with a pH of 5.25? [K_a(C₂H₅COOH) = 1.34 * 10^-5]

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Quizplus · Accepted Answer

To find the volume of KOH needed, use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Calculate pKa from Ka, then solve for the ratio [A-]/[HA] using the desired pH. Use stoichiometry to find the volume of KOH needed to achieve this ratio.

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