Studies in iron oxide sols. Part II. Membrane equilibrium in iron oxide sol

Abstract

The unequal distribution of an electrolyte across a semipermeable membrane, in the presence of iron oxide sol is partly due to the establishment of (a) the membrane equilibrium and (b) hydration of micelles. Assuming that ten per cent. of the bound hydrogen ions are active in membrane equilibrium the hydration in the case of iron oxide micelles is calculated. It has been found that there are about 441 millimoles of water to one gram of iron oxide.