Abstract
The influence of ultrasonic waves on the hydrogen ion concentration of several colloids have been studied It has been found that the sols of antimony sulphide, arsenious sulphide, stannic hydroxide, chromium hydroxide, vanadium pentoxide and manganese dioxide show slight decrease in pH values. On the other hand the sols of prussian blue, copper ferrocyanide, uranium ferrocyanide, aluminium hydroxide and cerium hydroxide show an increase and that of ferric arsenate, ferric phosphate and ferric hydroxide do not show any change in pH values. Further the sols of antimony sulphide, arsenic sulphide, manganese dioxide and uranium ferrocyanide coagulate on prolonged exposure and ceric hydroxide sol sets to a gel.
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