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Important points

Ultra microscope is prep by Zsigmondy in 1903

It can not give any info about particle shape and size.

Tyndall effect is used to distinguish b/w true sol and Colloid.

3. Colour

1. The colour of colloidal sol" depends on the

wavelength of light scattered.

2. The wavelength depends on size and Nature of

Dispersed particle.

4. Brownian's Movement

1. The continuous zig-zag motion of Colloidal particles by

the unbalanced bombardment of particles of D.M.

2. Smaller the size & viscosity of sol", faster is the movement

3. It produces Stirring effect due to which ppt does not occur

which stabilizes colloid.

4. The motion is independent of the nature of colloid.