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### Theory:

We all have tasted milk, right? In everyday life, the products we use, such as mayonnaise, jelly, and butter are colloidal solution.

The dispersed phase and the dispersion medium make up a colloidal solution, which is a heterogeneous system.

For example, the dispersion medium or dispersed phase might be a solid, liquid, or gas. There are a total of eight possible combinations.

It is impossible to combine gas in gas since it always forms a true solution.
A colloidal solution is a heterogeneous mixture.

In the colloidal solution, the particles of a colloid uniformly spread throughout the solution.

A colloidal solution contains finely divided particles (Approximately $$1$$ to $$1000$$ millimicrons in size), dispersed within a continuous medium in such a manner that prevents them from being filtered easily or settled rapidly.
Example:
1. Milk
2. Hair cream
3. Toothpaste
4. Fog, Mist, Smog
5. Cheese butter
6. Paint etc.
Properties of a colloidal solution:

Colloidal solution

1. A colloidal solution is a heterogeneous mixture.
2. A colloidal solution is quite stable so that it does not settle down when left undisturbed.
3. The particle here is so tiny that you cannot see them with naked eyes.

Tyndall effect

4. Colloidal particles can scatter a beam of light passing through it and make its path visible.

Classification of colloids based on the physical state of the dispersed phase and dispersion medium:

a. Dispersed phase: The dispersed phase is described as a phase that is scattered or present in the form of colloidal particles.

b. Dispersed medium: The dispersed phase is the medium in which colloidal particles are distributed.

Classification of colloids and its example

 S.No Name Dispersed phase(Solute) Dispersed medium(Solvent) Example 1 Solid sol Solid Solid Colored glass, Gems, Alloys. 2 Sol Solid Liquid Paint, Fruit jellies, Dye, Ink, Egg white 3 Aerosol Solid Gas Smoke 4 Gel Liquid Solid Cheese, Butter. 5 Emulsion Liquid Liquid Milk, Oil in water, Mayonnaise, Face cream. 6 Aerosol Liquid Gas Fog, Mist, Clouds, Body sprays. 7 Foam Gas Liquid Soap lather, Shaving cream, Coffee froth 8 Solid foam Gas Solid Rubber, Sponge, Cake, Bread