Question

Is matter around us pure? What is a solution? What is a colloidal solution?

Answer 1

Hint : We know that a solution is a homogeneous mixture of two or more than two substances whose particle size is $0.1nm\text{ }-1nm.$ Homogeneous means that the components of the mixture form a single phase. Also known as colloids or colloidal suspension, the colloidal solution can be defined as a mixture of particles of substances.

Complete Step By Step Answer:
Colloids generally represent a solution system in which the particles comprising that system have a particle size intermediate that of a true solution and a coarse dispersion, roughly ranging between $1nm$ to $500\text{ }nm$ (or $1nm\text{ }to\text{ }0.5\mu m$ ). A colloidal solution may be considered as a two-phase (heterogeneous) system under some circumstances, while it may be considered as a one-phase (homogeneous) system under other circumstances. We can prepare solutions of solid liquid, solid-solid, solid-gas, liquid-solid, liquid-liquid, gas-solid, gas-liquid and gas-gas. Gasoline, alloys, air, starch solution etc. are examples of solutions
The matter around us is not pure. As a pure substance comprises only a single substance. But the matter around us is a mixture of many components hence matter around us is not pure. A solution is a homogeneous mixture comprising two or more components. In a solution the substance dissolved is the solute and the medium in which the solute is dissolved is called solvent. Colloidal solution: The solution mixture in which one of the particles of the solution are dispersed through another substance.

Note :
Remember that the lyophilic colloidal sols are usually obtained by simply dissolving the required material (whose sol is to be prepared) into the solvent that is being used. The most common examples of the formation of sols are dissolving acacia in water, dissolving gelatin in water or dissolving celluloid in amyl acetate.