Colloid

Colloid

Colloids

Colloids are mixtures containing particles that are intermediate in size between those of true solutions and suspentions.

Property	True solution	Colloid	Suspension
Particle type	Ions,small molecules	Large molecules,particles	Large particles
Particle size	0.1-1nm	1-100nm	100nm and larger
Tyndall effect	No	Yes	Yes

Tyndall effect

Colloidal particles exhibit the Tyndall effect. Light is reflected in all directions from particles in colloids. The Tyndall effect is not observed with a true solution.

Colloid(milk) & True solution(K₂Cr₂O₇)

Coagulation

Charged colloidal particles form aggregates and precipitate from the dispersion when ions of opposite charge are added.

Coagulation

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