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A determination of the Cu63 nuclear resonance line width in concentrated hydrochloric acid solutions containing both cuprous and cupric chloride leads to an evaluation of the bimolecular rate constant k for the electron exchange process Cu+++Cu+→+Cu++Cu++.The experimentally determined value for k is k = 0.5×108 liter/mole-second.
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McConnell et al. (1956) studied this question.
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