The infrared absorption bands of water in the 1.1hyphen; to 1.3hyphen;mgr; region have been studied. Variations in intensities of three bands have been used to calculate for ionic solutions the mole fractions of water molecules in which zero, one, and two of the hydrogens are involved in hydrogen bonding. The average sizes of water clusters in HCl, HBr, HNO3, HClO4, H2O2, NaOH, KOH, NaNO3, and NaClO4solutions were calculated. From this and from qualitative evaluations for other solution systems, it was possible to assign the following effect on the water structure to the ions:cations:orderminus;producing:thinsp;La3plus;Mg2plus;Hplus;Ca2plus;,orderminus;destroying:Kplus;Naplus;Liplus;Csplus;equals;Agplus;;anions:orderminus;producing:OHminus;Fminus;,orderminus;destroying:ClO4minus;Iminus;Brminus;NO3minus;Clminus;SCNminus;.
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