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A particular acid (HA-) with pka=5.64 is used to make a buffered solution with a pH of 5.28 ; the total salt concentration is 43

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A particular acid (HA-) with pka=5.64 is used to make a buffered solution with a pH of 5.28 ; the total salt concentration is 43 mm. How many millimoles of conjugate base [A-] were used? Hint: Use the Henderson-Hasselbalch equation and this equation [HA] + [A-] = 43

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