STABILITY AND ELECTROKINETIC POTENTIAL OF STANNIC OXIDE SOL

The velars of ζo has been calculated by using Smoluchowski's equation from electro-osmotic and eletrophoretic data on stannic oxide sol in the region of slow coagulation in presence of the chlorides of Na+, Ba2+, Al3+ and CO(NH3)36+. The specific conductivity 'S' of the supernatant solution in equilibrium with the coagulum has also been measured. A plot of I/ζ against I/S yields a straight line which makes an intercept (I/ζ) on the I/ζ axis. This has been identified faith the true electrakinetic potential of the sol in presence of the equicoagulatiog concentrations of the electrolytes mentioned above. The average value of true 'ζ' potential determined by the electrophoretic and electro-osmotic methods of the given stannic oxide sot under the conditions mentioned above is equal to –37.0 mv