Give an example of a colloid?

Milk is a colloidal solution that appears to be homogeneous but actually is heterogeneous.

Colloids

A colloid is typically a two-phase system consisting of a continuous phase (the dispersion medium) and a dispersed phase (the particles or emulsion droplets). The particle size of the dispersed phase typically ranges from 1 nanometre to 1 micrometre. Some examples include whipped cream, mayonnaise, milk, butter, gelatin, jelly, muddy water, plaster, coloured glass, and paper.

Classification

Based on the Nature of Interaction Between Dispersed Phase and Dispersion Medium

  • Hydrophilic colloids: These are water-loving colloids. Examples include Agar, gelatin, pectin, etc.
  • Hydrophobic colloids: These are the opposite in nature of hydrophilic colloids and are also called irreversible sols. Examples include Gold sols, clay particles, etc.

Further reference

  1. What are the Properties of Colloids
  2. Is matter around us is pure? What is a solution? What is a colloidal solution?

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