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The interaction of paramagnetic cations with paramagnetic anions in solution is considered. The resultant broadening of the paramagnetic resonance lines of one of the species can be used to measure rates of formation of ion-pairs in cases in which the interaction is strong. Experimental results are given for a number of ions in water and compared to theoretical rates of diffusion controlled reactions between ions of opposite charge. The effect of the presence of inert, diamagnetic ions in the solution is considered.
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Pearson et al. (1962) studied this question.
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