Abstract
The diffraction patterns of concentrated KOH and LiCl solutions have been analyzed. The results indicate that the hydration number for the OH— ion is 6. Previous work on less concentrated KOH solutions had indicated a hydration number of 4 for the K+ ion and a substitutional entry of the cation into the water lattice. The present work agrees with these findings. The dissolution process in LiCl appears to be of a different nature, in that there is a breakdown of the water structure, probably caused by the Li+ ion. The water molecules and the hydrated Li+ ions then pack around the large Cl— ion to give an apparent hydration member for Cl— of 8–9.
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