19) The detailed results of the viscosities of La(CI04)3 solutions became available to the author after the manuscript of this paper was submitted for publication. It can be shown that the relaxation rates of the lanthanum-139 in La(CI04)3 solutions conform to the macroscopic viscosities; however, the relaxation rate at infinite dilution, 1/7",°, obtained from a fit to eq 7, is 312 sec-1, which is considerably higher than the value of 1/7,°= 277 sec-1 obtained for chloride solutions. Thus our conclusion regarding the formation of outer-sphere ion pairs with perchlorate ions receives further support. (20) F.

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