Date of Award

12-1993

Degree Name

Master of Arts

Department

Chemistry

First Advisor

Dr. Donald R. Schreiber

Second Advisor

Dr. Thomas Houser

Third Advisor

Dr. Ralph Steinhaus

Access Setting

Masters Thesis-Open Access

Abstract

The densities of mixtures of aqueous solutions of hydrochloric acid and cadmium chloride, copper chloride, manganese chloride, and zinc chloride have been measured at constant ionic strengths of 1.0 and 3.0 molal at 25 °C. In the case of HCl, CdCl2 , and ZnCl2 the literature data were refit using Pitzer' s apparent molal volume equation and the binary solution parameters were determined. Density data were used to determine the volume of mixing (∆Vm). Data from Torok and Berecs were combined with our data for the mixtures with CuCl2 and MnCl2. Pitzer's volume of mixing equation was fit to the volume of mixing data to obtain the parameters θ(v0)MN, θ(v1)MN, and ψvMNX· These parameters are the pressure derivatives of Pitzer's free energy equation parameters.

The heats of mixing (∆Hm) of solutions of cadmium chloride, copper chloride, manganese chloride, and zinc chloride with solutions of hydrochloric acid were measured at constant ionic strengths of 1.0 and 3.0 molal at 25 °C. The excess enthalpy equation of Pitzer was fit to the resulting ∆Hm data to obtain the Pitzer mixing parameters θL(0)MN, θL(1)MN, and ψLMNX· These parameters are the temperature derivatives of the free energy equation parameters.

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