CHARGE AND STABILITY OF COLLOIDS. PART III. POTENTIOMETRIC TITRATIONS OF FERRIC HYDROXIDE SOL

The discrepancy in the results of Rabinowitsch and Weiser in the amounts of. the counter-ions released on adding precipitating ions of varying valency to a ferric hydroxide sol has been investigated. It has been proved that the amount of the counter-ions released from a sol of ferric hydroxide depends on the purity of the sol. The quantity of the released chlorine from a ferric hydroxide sol gets smaller and smaller as the purity of the sol is increased by progressive dialysis, In the case of more impure sole the chlorine released is super-equivalent, whereas with increase of parity the quantity released is less than the chlorine equivalent of the added electrolyte.