The need for a more complete quantitative description of aqueous electrolytic solutions has led to a renewal, in recent years, of interest in determining the stability constants and formulas for the species present are not as simple as previously believed. Of particular interest are the species formed by the interaction of polyvalent metal ions with the solvent molecules and with the anions present. It was felt that an investigation pf a polyvalent metal ion in a mixed solvent could be of value in helping to clarify the interaction of metal ions with the solvent. This investigation was planned as a preliminary study of the system iron (III) perchlorate-ethylene glycol water, the major portion of the data to be obtained spectrophotometric al...