The partial pressure of water in the low water concentration region has been determined for ten binary waterorganic solvent systems at 25.0".Assuming Henry's law to be obeyed by individual molecular aggregates of water, w e have calculated association constants for water in the various solvents. Statistical evidence is given to support the conclusions that monomerdimer equilibrium prevails in some of the solvents and monomer-trimer equilibrium in others.WE have reported the solubility of water as a function of water activity in a number of organic solvents.1*2 Water exists primarily as monomer in cyclohexane, carbon tetrachloride, toluene, and benzene, whereas in 1,2-dichloroethane and 1,1,2,2-tetrachloroethane, in addition to monomers, polymers are present a t the higher water activities. The polymerisation of water in these solvents was interpreted as a monomer-trimer equilibrium; however, the assumption of monomertetramer equilibrium could equally well explain the results. I n a search for systems that would dissolve water in excess of O -O ~M , we extended our study to a series of solvents having one or more proton-accepting groups, to clarify the nature of water aggregates in non-aqueous media.3EXPERIMENTAL AND RESULTS
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