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American Journal of Science, Vol. 301, February 2001, P.103-111

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Gibbs Energy of Formation of Dolomite from Electrochemical Cell Measurements and Theoretical Calculations

Peter A. Rock*, Gregory K. Mandell*, William H. Casey** and Erin M. Walling***

* Department of Chemistry, University of California, Davis, California 95616
** Department of Land, Air, and Water Resources and Department of Geology, University of California, Davis, California 95616
*** Department of Chemistry and Department of Land, Air, and Water Resources, University of California, Davis, California 95616

New thermodynamic data are presented for the Gibbs energy of formation of dolomite (CaMg(CO3)2(s)). Using electrochemical cells, we find {Delta}Gf°[CaMg(CO3)2(s))] equal to –2147.82 kJ · mol–1. The performance of lattice energy calculations on dolomite, calcite, and magnesite yields a theoretical value of –2148.90 kJ · mol–1 for {Delta}Gf° [CaMg(CO3)2(s))]. Both our theoretical and experimental results show excellent agreement with drop calorimetry experiments done by Capobianco and Navrotsky (1987) which were used to determine the enthalpy of formation of dolomite from those of calcite and magnesite.






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