Abstract
Absorption isotherm curve of pure halogenic acids on wool has been obtained by electro-conductivity method. The values of 0.85 and 0.88 equivalents of HCl and HI per kilogram of wool have respectively been determined by inspection of the curve and by appling the Donnan theory of menbrane equilibrium the value obtained for the pH at 0.85/2 and 0.88/2 equivalents absorbed by wool are 2.3 and 2.5 Donnan theory supports that none of the halogen ions are combined with wool, but it was found from the above that I- has an affinity of wool as compared with the Cl-. Therefore the complete treatment of Donnan theory, considering anion affinity, leads to the following expression:
instead of where a is the total hydrogen ions taken up by the fiber, V, the volume of internel solution, and f, the corrective coefficient (0-1) of anion affinity.
