Question

By giving two characteristics define the colloidal solution.

Answer 1

Colloids:

• A colloid is a solution in which the size of solute particles is between those in true solutions and those in suspensions.
• A colloid is a mixture in which particles of an insoluble substance are suspended throughout another substance.
• In this solution in which the size of solute particles is between those in true solutions and those in suspensions.

Characteristics of colloidal solution:

• Colloids are heterogeneous in nature.
• The size of particle ranges from$1nanometer\left({10}^{-9}m\right)to1micrometer\left({10}^{-6}m\right)$.
• In a colloidal solution, particles can scatter light and the path of the light beam becomes visible.
• This scattering of light by colloidal particles is known as the Tyndall effect.

Examples of colloids

Examples 1: smoke and dust in the air

Solid dust particles are suspended in a gaseous air medium.

Examples2: milk and mayonnaise

In this example, both the solute and solvent are liquid and called an emulsion.