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Spectra recorded for water aprotic solvent solutions in which the mole fraction of water is less than 1 per cent have enabled the resolution of the v 1 + v 2 + v 3 combination band of water into three Gaussian components. One band is due to the situation in which the two water protons are bonded to an acceptor with approximately equal hydrogen-bond energies. The other two bands are due to the situation in which the protons are bonded with unequal bond strengths. The positions of all three bands are dependent on the “basicity” of the hydrogen-bond acceptor. These data have led to a reinterpretation of spectral data for aqueous solutions. Pure water appears to exist as a liquid in which there are many distorted hydrogen-bonds of varying strengths but few broken bonds. The addition of an electrolyte appears to increase the number of symmetrically bonded water molecules possibly due to ion-dipole interactions.

Summaries of the results of ion-exchange equilibria and of maximum water uptakes at 25 deg of Dowex 50 resins of 4, 8, and 16% DVB content are given for the following systems: NH/sub 3/OH/sup +/ -H/sup +/, Ca/sup +2/ - Ni/sup +2/, Mn/ sup +2/Ni/sup +2/, Ba/aup +2/ - Be/sup +2/, Ce/sup +3/Ag/sup +/, La/sup +3/ - Ce/ sup +3/, Ce/sup +3/ - Cr/sup +3/. (J.S.R.)