Abstract
A statistical mechanical model of chemically reactive fluids in an inert solvent exhibiting liquid-gas criticality is studied using analytically solvable integral equation approximations. The model consists of a mixture of three molecular species (A, B and C), two of which (the solutes A and B) can undergo reaction and one of which (the solvent C) is inert. Particular interest centres on the results for the chemical equilibrium obtained near the mixture critical point of the solution.