completion and infinity absorbances were taken at 10 half-lives. The pH(D) of the solutions was measured at the end of each run. Firstorder rate constants were determined from plots of log ( A , -&).Experimental values of k,, ko. and n were used with a nonlinear least-squares computer program to fit the data to the various models using the fractionation factors as variable parameters.
Acknowledgment. This work was supported by the Robert A. Welch Foundation and the Texas A&M College of ScienceOrganized Research Fund. W e thank Dr. Michael Hall for providing the nonlinear least-squares curve-fitting program and for his assistance in its utilization.Abstract: The gas-phase reaction, IsOH-+ RCOOR' -RCO'*O-(or RCOO-) + neutrals, has been investigated by ion cy-
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