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A cation-exchange resin in the H+-form has been used in an investigation of solutions containing copper (11) chloride complexes. Values have been obtained for the stability constants, pj = [CuClj(2-j)+]/[Cu2+][ClT]j ( j = 1, 2, 3, and 4), which are valid for 20" and ionic strength 0 . 6 9 1 ~ maintained with perchloric acid.THIS paper reports the application of the cation-exchange resin Amberlite IR-120 to a study of copper(I1) chloride complexes. Values for the individual stability constants, defined by pj = [CuClj@-J>+]/[Cu2+][C1-]j ( j = 1, 2, 3, and 4), have been obtained. Since appreciable concentrations of chloride are required for the formation of the four successive CUCI&~ --A+ species in significant quantities in aqueous solution, the ionic strength of the solutions studied has been held constant at the quite high value of 0 . 6 9 1 ~ by the use of perchloric acid. The tacit assumption has been made that ion association between C10,-and Cu2+ is negligible. Since the ionic strength of the solutions has been such that interionic-attraction theories cannot be rigorously applied, the evaluation of '' true " or " thermodynamic " stability constants has been precluded.

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