Aruba Landsexamen VWO Practice Questions - Aruba Landsexamen VWO (Pre-University State Examination) Exam

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A buffer solution contains 0.20 M ethanoic acid (CH3COOH, K_a = 1.8 * 10^-5, pK_a = 4.74) and 0.20 M sodium ethanoate (CH3COONa). Using the Henderson-Hasselbalch equation (pH = pK_a + log([A-] / [HA])), what is the pH of this buffer?

pH = 7.00 pH = 1.80 pH = 4.74 pH = 5.74

Correct Answer:

pH = 4.74

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