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The theory of response reactions (RERs) or response equilibria was elaborated for the thermodynamic systems in which more than one equilibrium is established simultaneously. It is based on detailed analysis of the Hessian determinant. The theory derives the sensitivity coefficient as the sum of the contributions of individual RERs. Thus all phenomena which are in apparent contradiction to the Le Chatelier principle could be interpreted. With the help of RERs the equilibrium coupling was defined. RERs could be derived based either on the species, or on the stoichiometrically independent reactions of a parallel system. The set of RERs is unambiguous in a given system; and the number of them (M) is , where S denotes the number of species and C refers to the number of components. In the case of three-component systems, RERs can be visualized on a triangle diagram.
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