1. The dimerisation equilibrium of acetic acid changes very markedly with the concentration of the other component.

2. The rate constant of that dimerisation was estimated to be k2=2×105 liter × mole−1 × sec−1.

3. The examples deal with the conformational equilibrium of the dihalogenoethanes, the dimerisation equilibrium of acetic acid, and the associative behaviour of phenol in mixtures with nonpolar solvents.