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The hydrolysis of a substance is catalyzed specifically by hydrogen ions, the catalyzed rate constant is being given by k (s-1) = 4.70x10-2[H+]. When the substance is dissolved in a 1.20x10-3 M solution of HA, the catalyzed rate constant was found to be 3.20x10-5. Calculate the dissociation constant, Ka, of HA.

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