Abstract
In this paper it is performed a historical account of the theoretical roots that grounded the following four key basic ideas of chemical equilibrium: ‘incomplete reaction’, ‘reversibility’, ‘equilibrium constant’ and ‘molecular dynamics’. These notions developed in nineteenth-century as a consequence of the evolution of the concept of chemical affinity. The discussion begins with the presentation of the earliest affinity table [‘Table des rapports’] published in 1718 by Geoffroy. Afterwards, it is examined Bergman’s compilation. The theory supporting this arrangement assumed that chemical displacement reactions were complete and could not be reversed. It is analysed how Berthollet’s model showed the inadequacy of this view. His new conceptual considerations established that the amount of the substances involved in a reaction was an essential factor determining its direction, which accounted for the early concepts of incomplete reaction and reversibility. Guldberg and Waage specified the role of mass in chemical equilibrium reactions as they considered the concentrations of the chemicals involved, formulating the first chemical equilibrium mathematical equation that approximates what is called nowadays chemical equilibrium constant. Finally, it is presented how Pfaundler was the first to consider the kinetic theory in the interpretation of the macroscopic properties of equilibrium reactions.
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Notes
Pages 380–381.
Two English translations are available: (a) Concerning the different affinities observed in chemistry between different substances In: Leicester, H. M., Klickstein, H.S. A Source Book in Chemistry, 1400–1900. Harvard University, Cambridge, MA, 67–75 (1963); (b) Geoffroy, E.F.: Table of the different relations observed in chemistry between different substances. Science in Context 9, 313–319 (1996).
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The reference given corresponds to an English translation of the original work published in 1864.
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Translated: Pfaundler, L.: A Contribution to Chemical Statics. Bull. Hist. Chem. 36(2), 87–97 (2011). The quotations given in this paper refer to this recent translation.
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Quílez, J. A historical/epistemological account of the foundation of the key ideas supporting chemical equilibrium theory. Found Chem 21, 221–252 (2019). https://doi.org/10.1007/s10698-018-9320-0
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DOI: https://doi.org/10.1007/s10698-018-9320-0