Question

How does the particle size vary in a true solution, a suspension and a colloid?

Answer 1

Particle size in a true solution is the smallest and the particle size of suspensions is the largest.

• True solution: It is a homogeneous mixture in which the particles are not visible to the naked eyes. Example: Salt solution etc.
• Suspensions: It is a heterogeneous mixture in which the particles are visible to the naked eyes. Example: Chalk dissolved in water etc.
• Colloids: It is a heterogeneous mixture in which particles are invisible to the naked eye but are visible through a powerful microscope. Example: Milk, blood etc.

Diameter of the particles is given in the table below:

Type of mixture	Diameter of the particles
True solution	$<{10}^{-9}\mathrm{m}$
Suspension	$>{10}^{-6}\mathrm{m}$
Colloid	${10}^{-6}-{10}^{-9}\mathrm{m}$