What is the rate constant of the reaction

Question

Problem

The hydrolysis of ArOCOCH₃ to ArOH is base catalyzed. At values of pH > 2 acid catalysis is unimportant. The uncatalyzed reaction rate k₀ is 4 × 10^-5 s^-1 at 20^oC.At pH = 8, what is the rate constant of the reaction? How much time will it take to reduce the concentration of the compound to 95% of the original value in a lake of pH 8 at 20^oC?

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