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A procedure was devised for extracting from spectrophotometric data the concentration of the two solute species formed when metallic Ri is dissolvled in molten BiC1,. The functional relation between these concentrations was iound to be in accord with a family of solute equilibria of which the simplest was 4Bi+ = Bid4+.The equilibrium constant K A was computed to have a value of 3.8 X lo6 at 264". This is within experimental error of the value, 2.7 X 106, obtained by a previous e.rn.f. study. IntroductionDuring the past two years the large uncertainty in the identification of the solute species formed when bismuth metal dissolves in molten bismuth trichloride4 has been reduced substantially a1 though not obliterated. Topol and Osteryoung5 obtained polarographic evidence that Bi+ may be the dominant solute species a t solute-bismuth concentrations below about 0.2

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