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Question

Explain the differences between:

colloid and suspension


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Solution

Differences between colloid and suspension:

Colloid

Suspension

1. A colloid is a heterogeneous mixture in which the diameter of particles is 10-6-10-9m1. A suspension is a heterogeneous mixture in which the diameter of the particles is >10-6m (greater than 10-6m)
2. The particles of colloids are not visible to the naked eyes but visible through a powerful microscope.2. Particles are visible to the naked eyes due to the greater size.
3. Particles of colloids do not settle down under the influence of gravity when left undisturbed.3. Particles of suspensions that remain suspended in the solvent settle down at the bottom of the container under the influence of gravity when left undisturbed.
4. All colloids scatter the beam of light passing through it and make the path of light visible called the Tyndall effect.4. In general, suspensions do not show the Tyndall effect. However, it is observed in suspensions with fine sized particles.
5. Brownian movement i.e.; the random zig-zag movement of particles is observed in the solvent (dispersion medium).5. In general, Brownian movement is not shown by suspensions because of large particle size. However, it is observed in suspensions with fine sized particles.
6. Colloids are translucent to light i.e.; allow light to pass through them only partially. 6. Suspensions are opaque to light i.e.; they do not allow light to pass through them.
7. Examples: Milk, blood, soap solution etc.7. Examples: Muddy water, mixture of limestone or Calcium carbonate (CaCO3) in Water (H2O).

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