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Solution - Colloidal Solution

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Properties of colloid

notes

Types of solutions:

Various types of solutions are:
(i) Solid in a solid solution: Alloys.

(ii) Solid in a liquid solution: Sugar solution, salt solution.
(iii) Liquid sin a liquid solution: Lemon water, vinegar (acetic acid in water)
(iv) Gas in a gas solution: Air.

(v) Gas in a liquid solution: Soda water.

Colloids: Colloidal solutions, or colloidal suspensions, are nothing but a mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly all through another substance.

Tyndall effect can be observed when sunlight passes through the canopy of a dense forest. In the forest, mist contains tiny droplets of water, which act as particles of colloid dispersed in air.

The Tyndall effect

Properties of a colloid :

• A colloid is a heterogeneous mixture. 
• The size of particles of a colloid is too small to be individually seen by naked eyes.
• Colloids are big enough to scatter a beam of light passing through it and make its path visible.
• They do not settle down when left undisturbed, that is, a colloid is quite stable.
• They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known
as centrifugation can be used to separate the colloidal particles.

Common examples of colloids :

Dispersed phase

Dispersing medium

Type

Example

Liquid

Gas

Aerosol

Fog, clouds, mist

Solid

Gas

Aerosol

Smoke, automobile exhaust

Gas

Liquid

Foam

Shaving cream

Liquid

Liquid

Emulsion

Milk, face cream

Solid

Liquid

Solution

Milk of magnesia, mud

Gas

Solid

Foam

Foam, rubber, sponge, pumice

Liquid

Solid

Gel

Jelly, cheese, butter

Solid

Solid

Solid solution

Coloured gemstone, milky glass

Shaalaa.com | Colloids, Solution and suspension introduction

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