Colloids are also referred to as colloidal solutions or systems. A colloid is a mixture of two or more components that are mixed physically rather than chemically. Colloids are mixtures in which minute, soluble particles of one substance are immersed in a different substance. Particles can be 0 to 1000 nanometers in size.
The area of the colloidal solution where the particles are equally dispersed. For example, soda water includes gas and water; here dispersion medium is water.
The phase that is uniformly spread across the colloidal solution is known as the dispersed phase. For example, soda water includes gas and water; here dispersed phase is gas.
Types of Colloids
It is made up of liquid or solid particles suspended in a gas.
The emulsion is a colloid formed by multiple liquids, one of which is a dispersion of another.
It is made up of gas spread in a solid or liquid.
It consists of tiny solid particles suspended in a liquid.
Gels are colloidal solutions in which little liquid drops are dispersed across a solid dispersion medium.
Preparation of Colloids
1. Chemical methods:
Chemical processes such as double decomposition, oxidation, reduction, or hydrolysis can generate colloidal dispersions.
2. Electrical disintegration
It is used to create colloidal sols of metals like platinum, silver, and gold.
Peptization converts precipitate into colloids by mixing some peptizing agents.
Uses of Colloids
1. Classification based on physical phase
There are eight types of colloidal systems based on whether the dispersed phase and the dispersion medium are liquids, solids, or gases. The examples of several types of colloidal and their popular names are listed below:
2. Classification based on interaction
Colloidal sols are categorized based on how the dispersed phase interacts with the dispersion medium.
1) Lyophilic colloids:
Lyophilic sols are colloidal sols created by mixing liquid with gum, starch, gelatin, rubber, etc.
2) Lyophobic colloids:
Colloids with a very low affinity for the dispersion medium are called lyophobic colloids.
FAQs on Colloids
1. Differentiate lyophobic colloids and lyophilic colloids.
2. Define Colloids.
Colloids are mixtures of two substances in which microscopic particles are distributed and suspended over one another.
3. Specify the protection methods for lyophobic sol.
By including lyophilic sol, lyophobic sol can be protected.
4. List examples of colloids and specify the dispersed phase and dispersion medium.
Dispersed phase:Albumin serves
Dispersed phase:Water droplets
3) Gold sol:
Dispersed phase:Gold particles
Dispersing medium:Fruit pulp
Dispersed phase:Sugar syrup or water
6) Pumice stone:
List the four primary characteristics of colloids.