How are physical properties of colloidal solutions different from those of true solutions and coarse dispersions? Explain.
(i) Brownian movement: Robert Brown (1927) an English Botanist, observed that the pollen grains in aqueous suspensions were in constant motion. Similar phenomenon was, later on, found in case of colloidal solution, when observed ultra-microscopically.
This continuous and rapid zig-zag motion of the colloidal particles is called Brownian movement. This motion is independent of the nature of the colloidal particles. It is more rapid when the size of the particles is small and the solution is less viscous.
Cause of Phenomenon:
The Brownian movement is due to the bombardment of colloidal particles by molecules of dispersion medium. The intensity of motion depends upon the size of the particles and the viscosity of the
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