how dose colloidal solution differ from true solution?
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True solution and colloidal solution are two types of solutions based on their distinct properties. True solution and colloidal solution differ in many properties such as particle size, appearance of the solution, filterability, and visibility. These mainly arise due to the differences in solute particles sizes. The key difference between true solution and colloidal solution is, the nature of the true solution is homogeneous in contrast to the colloidal solution, which is a heterogeneous mixture.
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True Solution: A true solution contains a homogeneous mixture of two or more substances.
Colloidal Solution: A colloidal solution looks like a homogeneous solution, but it is a heterogeneous-mixture.
Particle Visibility:
True Solution: The solute particles of a true solution cannot be seen even with a microscope.
Colloidal Solution: The particles in a colloidal solution can be seen only with a powerful microscope.
Particle Size:
True Solution: The size of particles in a true solution is about 10-10 m.
Colloidal Solution: The size of solute particles in a colloidal solution is between 1 – 100nm.
Separation of Substances:
True Solution: The constituents in a true solution cannot be separated by filtration.
Colloidal Solution: The constituents of a colloid cannot be separated by filtration. However, they can be made to settle by centrifuging and then filtering by special filters.
Tyndall Effect:
True Solution: True solutions do not show Tyndall effect. (Do not scatter light)
Colloidal Solution: Colloidal solutions show Tyndall effect. (It is also known as “Tyndall scattering”, is light scattering by particles in a colloid or else particles in a very fine suspension)
Examples of True Solution and Colloidal Solution:
True Solution: When we put substances such as salt, sugar in water, they completely get dissolved to form homogeneous solutions. In other words, these solute molecules uniformly disperse in water. Particles in true solutions are of molecular size, and they are invisible. Moreover, these particles do not settle on standing. Examples of true solutions are:
Solution of common salt in water
Solution of sugar in water
Sugar and alum
Colloidal Solution: Some substances are completely soluble in solutions (sugar in water), and some are completely insoluble (sand in water). There is an intermediate category in between these two types; those particles are bigger in size than molecules and smaller than suspension particles. They are visible under a powerful microscope. Some examples of colloidal solutions are,
Starch in water
Egg albumin in water
Colloidal Solution: A colloidal solution looks like a homogeneous solution, but it is a heterogeneous-mixture.
Particle Visibility:
True Solution: The solute particles of a true solution cannot be seen even with a microscope.
Colloidal Solution: The particles in a colloidal solution can be seen only with a powerful microscope.
Particle Size:
True Solution: The size of particles in a true solution is about 10-10 m.
Colloidal Solution: The size of solute particles in a colloidal solution is between 1 – 100nm.
Separation of Substances:
True Solution: The constituents in a true solution cannot be separated by filtration.
Colloidal Solution: The constituents of a colloid cannot be separated by filtration. However, they can be made to settle by centrifuging and then filtering by special filters.
Tyndall Effect:
True Solution: True solutions do not show Tyndall effect. (Do not scatter light)
Colloidal Solution: Colloidal solutions show Tyndall effect. (It is also known as “Tyndall scattering”, is light scattering by particles in a colloid or else particles in a very fine suspension)
Examples of True Solution and Colloidal Solution:
True Solution: When we put substances such as salt, sugar in water, they completely get dissolved to form homogeneous solutions. In other words, these solute molecules uniformly disperse in water. Particles in true solutions are of molecular size, and they are invisible. Moreover, these particles do not settle on standing. Examples of true solutions are:
Solution of common salt in water
Solution of sugar in water
Sugar and alum
Colloidal Solution: Some substances are completely soluble in solutions (sugar in water), and some are completely insoluble (sand in water). There is an intermediate category in between these two types; those particles are bigger in size than molecules and smaller than suspension particles. They are visible under a powerful microscope. Some examples of colloidal solutions are,
Starch in water
Egg albumin in water
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