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The coupled or equivalent exchange of the cations and anions of 11 salts, chiefly alkali metal and alkaline earth chlorides, with surface Hf and OH-of a commercial a-basic aluminum oxide was studied. Adsorption equilibrium constants and reaction site densities are reported. These site densities and those for two salts with other aluminas are low, so that the area per site is of the order of 1-10 X lo2suggesting the reaction is very specific.In three other systems which are a t least partially irreversible (where the salts are LiC1, XiC12, or Cu(N03)*) the total amount of reaction with the surface is much greater. Here, there are probably both exchange reactions, which are partially irreversible, and equivalent exchange reactions.Site density depends upon both anion and cation.