Abstract
We report calculations at the ab-initio level on the hydration equilibria of substituted acetates XCH 2CO 2 − + nH 2O ⇌ XCH 2CO 2 − with nH 2O up to n = 3. Results are also given for the hydration energies of the corresponding acetic acids. These results allow the calculation of the acidities of the acetic acids in the presence of a limited number of water molecules. Such results are compared to experimental figures in the gas phase and in aqueous solution. Results for three water molecules per acetate ion and one per acetic acid molecule approach those found for aqueous solution.
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