5.14 How are colloids classified on the basis of
(i) physical states of components
(ii) nature of dispersed phase and
(iii) interaction between dispersed phase and dispersion medium?
(i) On the basis of the physical state of the components (by components we mean the dispersed phase and dispersion medium). Depending on whether the components are solids, liquids, or gases, we can have eight types of colloids.
| Dispersed phase | Dispersion medium | Type of colloid | Example | |
| 1. | Solid | Solid | Solid Sol |
Gemstone |
| 2. | Solid | Liquid | Sol |
Paint |
| 3. | Solid | Gas | Aerosol |
Smoke |
| 4. | Liquid | Solid | Gel |
Cheese |
|
5. |
Liquid | Liquid | Emulsion | Milk |
| 6. | Liquid | Gas | Asrosol |
Fog |
| 7. | Gas | Solid | Solid foam |
Pumice stone |
| 8. | Gas | Liquid | Foam |
Froth |
(ii) On the basis of the dispersion medium, sols can be divided as:
| Dispersion Medium |
Name of sol |
| Water |
Aquasol or hydrosol |
| Alcohol |
Alcosol |
| Benzene |
Benzosol |
| Gases |
Aerosol |
(iii) On the basis of the nature of the interaction between the dispersed phase and dispersion medium, the colloids can be classified as lyophilic (solvent attracting) and lyophobic (solvent repelling).
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