Equilibrium constants for the formation of Cu(I) halide complexes

The stoichiometric equilibrium constants, K ₃ ^* , for the formation of CuX ₃ ²⁻ from CuX ₂ ⁻ +X⁻ where X=Cl and Br, have been determined from spectral measurements. The measurements were made in NaCl and NaBr solutions from I=0.5 to 6.0m at 5, 25 and 45°C. The measured constants were extrapolated to infinite dilution using the Pitzer equations. The Pitzer parameters, β⁰, β¹ and C^φ, for the interaction of Na⁺ with CuX ₂ ⁻ and CuX ₃ ²⁻ are briefly discussed.