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Unformatted text preview: ] log [A ] [HA] pK a = pH log [A ] [HA] pH = pK a + log [A ] [HA] A simplified way is to consider when one molecule of HA- dissociates to give an H + , another molecule of HA- can pick it up to give H 2 A: HA- H + + A 2- K eq = K a2 H + + HA- H 2 A K eq = 1/K a1 Net reaction: 2HA- H 2 A + A 2- K eq = K a2 /K a1 pH = pK a1 + pK a2 2 Henderson-Hasselbalch Equation Polyprotic acid...
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- Spring '08