Colloidal Solution





In Colloidal Solution particles of the substance are in the colloidal state (10^{-4}- 10^{-7}cm). It is a heterogeneous system consisting of two phases (i) Dispersed phase and (ii) Dispersion medium.

Dispersed phase + Dispersion medium     = Dispersed system (Colloidal solution)

If the dispersion medium is water, the colloidal solutions are called hydrosols or simply sols. If alcohol or benzene is the dispersion medium, it is called alcosol or benzosol etc.

Hence the colloidal solution may be defined as “The solution in which a certain substance is distributed in the form of very small particles (10^{-4}- 10^{-7} cm or 1 nm to 100 nm) as a dispersed phase in another substance called dispersion medium.”

Since dispersed phase and dispersion medium each may have three physical states (solid, liquid and gas) hence we may have nine types of colloidal systems.

But if dispersed phase and dispersion medium are in gaseous state then colloidal system does not exist because both are miscible with one another and give a homogeneous system.

Colloid of gas in gas type is not possible as the mixture of gases will be homogeneous i.e. with one phase.



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