The chemical potential in solutions and the free energy of reaction |
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Authors: | D B Shear |
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Affiliation: | Department of Biochemistry and Space Sciences Research Center, University of Missouri-Columbia, Columbia, Missouri 65201, U.S.A. |
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Abstract: | The expression for the chemical potential of a species in a multi-component solution is usually derived by a thermodynamic argument based on ideal gas theory. A direct statistical mechanical derivation is given below, using the methods of the preceding paper. The analysis is formulated in such a way that there is no need to introduce the notion of standard states. It is made clear why certain species (water, H+ in buffered systems) may be ignored in calculating the affinity (negative free energy change) of a chemical reaction. The equilibrium constant is expressed in terms of generalized phase integrals or partition functions. |
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