What is a colloidal solution?
ChemistryClass 10CBSEAnswered 28 May 2026
Answer
A colloid has particles of 1–1000 nm scattered through a dispersion medium appearing homogeneous to the naked eye but heterogeneous under a microscope.
- Particles do not settle.
- Shows the Tyndall effect.
- Cannot be separated by filtration.
Examples:
| Colloid | Dispersed Phase | Medium |
|---|---|---|
| Milk | Fat droplets | Water |
| Fog | Water droplets | Air |
| Blood | Cells/proteins | Water |
A colloid has intermediate-sized particles (1–1000 nm) that remain dispersed, appear homogeneous, and scatter light.