Abstract
1. 1. Equilibria between a sulfonic acid resin (Amberlite IR100) and salts of strong and weak acids are investigated. The limiting exchange (at high concentrations) is nearly the same for all alkali and alkaline earth chlorides and sulfates at low pH. It is greater for salts of weak acids, at higher pH, and increases in the order of decreasing acid dissociation constant. This suggests that the resin contains groups which are more weakly acid than -S0 3H, probably -COOH and phenolic -OH. The limiting exchange at pH = 2.0–2.5 is a few per cent below the strong acid equivalent as characterized by the sulfur content and the potentiometric titration curves. 2. 2. The law of mass action is applied to resin equilibria with salts of strong acids. The ratio of activity coefficients of the hydrogen ion to that of metal ion in the resin phase shows a marked variation with the experimental conditions. A number of possible causes for this is discussed.
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