“…But obtaining numerical values for 7 does not furnish a test of the equation; rather it is necessary to find some other relationship which 7 must satisfy, and then to make the test by means of the second equation. The further connection between 7 and concentration is suggested by equation 16. If we assume an equilibrium between long and short range pairs, controlled by the balance between Coulomb forces and thermal motion, then we have the mass action equation C72/V(ly) = K (26) where K_1 is given by equation 16. The term /2 is included in equation 26 to account for the effect of long range free ion-free ion interaction on the thermodynamic potentials involved in the derivation of equation 26.…”