Define colloids and their types:
- Colloids are mixtures of two or more substances in which one substance is dispersed evenly throughout the other substance.
- The particles of the dispersed substance are small enough to be dispersed evenly but are too large to be dissolved.
There are two main types of colloids: lyophilic and lyophobic.
a. Lyophilic colloids:
Lyophilic colloids are mixtures in which the particles of the dispersed substance are attracted to the particles of the dispersion medium. This type of colloid is also known as a sol. An example of a lyophilic colloid is blood, which is a mixture of red blood cells, plasma, and other substances.
b. Lyophobic colloids:
Lyophobic colloids are mixtures in which the particles of the dispersed substance are not attracted to the particles of the dispersion medium. This type of colloid is also known as a emulsion. An example of a lyophobic colloid is oil in water, where oil droplets are dispersed in water.