Question

Mention any three differences between Lyophilic and Lyophobic colloids.

Answer 1

We know that a colloid is a heterogeneous mixture of substances where very fine particles are dispersed in the dispersion medium. In lyophilic solutions, the dispersed phase particles have a great affinity for the dispersion medium. These solutions are reversible. Point to remember that in lyophobic sols, the dispersed phase particles have no affinity for the dispersion medium. These sols are irreversible. There is a different type of colloid based on the state and interaction between the dispersion phase and a dispersion medium.

Complete step by step answer:

Lyophilic colloids	Lyophobic colloids
PREPARATION-Easy to prepare just by mixing, shaking or heating substance with the dispersion medium.	PREPARATION-Require special methods to prepare and an electrolyte for stabilization.
STABILITY-It is Highly stable and does not coagulate easily on adding electrolytes.	STABILITY-It is Unstable and can easily be coagulated by electrolytes.
REVERSIBILITY-Reversible sols and can be reconstituted back by adding back the dispersion medium.	REVERSIBILITY-Irreversible sols and once precipitated, they cannot be reconstituted back just by adding the dispersion medium.
EXAMPLE-Some examples are starch, gum, gelatin sol etc.	EXAMPLE-Some examples are metal in water, ferric hydroxide sols etc.

Note: We need to understand that the phase that is scattered in the form of colloidal particles is called the dispersion phase, while the medium in which these colloidal particles are dispersed is known as the dispersion medium. The charge of the colloidal particles in lyophilic sol depends on the $pH$ of the medium. All particles in a lyophobic sol carry the same charge. The particles present in the lyophilic sol absorb ${H^ + }$ and $O{H^ - }$ ions from the medium. The particles in a lyophobic sol absorb ions from the medium.