A suspension is a heterogeneous mixture, mostly involving a fluid and solid particles in which the particles are separated and scattered around the fluid without dissolving in it.
A suspension contains mixture of two or more substances which are not fully miscible with each other. The particles in a suspension, instead of dissolving in the liquid, spreads throughout the liquid and can be seen by the naked eye.
A typical example of a suspension is a chalk dust in water. When chalk powders are added to water, the particles will not be dissolved but rather they will be spread throughout the water and if the mixture is left untouched, the dust will be settled at the base of the container and it can be filtered out.
Properties of a suspension
- Suspensions are heterogeneous in nature.
- The particles of a suspension do not dissolve but are rather suspended.
- Particles can be seen by the naked eye or by use of a microscope cause they are larger than 1 nanometer.
- Particles of a suspension exhibits the tyndall effect, thus they can scatter rays of light passing through it.
- When left untouched for some time, particles get settled in the bottom of the container due to gravity and can be separated by ordinary filtration.
Examples of suspension:
1. Muddy water: where salt, clay, or silt particles are suspended in water.
A suspension of sand in water
2. Sand in water.
3. Flour in water
4. Dust particles in air.
5. soot in air.
Other facts about suspensions
A suspension of a liquid or solid particles in a gas is known as an aerosol. Particles suspended in the atmosphere are called particulates. Particulates of the atmosphere consist of fine dusts, soot, evaporated sea salts, blogenic and volcanic sulphates.
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