. Explain the properties of Colloidal Solution


Best Answer

The characteristic properties of colloidal solutions are as given below.

i. HETEROGENEOUS NATURE

A colloidal solution is heterogeneous in nature. It consists of two phases, namely the dispersed phase and the dispersion medium.

ii. COLLIGATIVE PROPERTIES

A colloidal solution has very small value of mole fraction of dispersed phase due to high average molecular mass of the colloidal particles. As a result, all the colligative properties of a colloidal solution have quite low values when compared to true solution having same concentration. However, the low osmotic pressure of a colloidal solution is measurable and can be used to determine the molecular weight of colloidal particles.

iii. FILTERABILITY

The size of solute particles is smaller than the pore size of filter paper and therefore, they can readily pass through a filter paper. Colloidal particles, however cannot pass through ultra filters, parchment paper or animal membrane.

iv. TYNDALL EFFECT

When a strong beam of light is passed through a colloidal solution placed in a dark place, the path of light gets illuminated as a bluish light. This is known as Tyndall effect and is caused by the scattering of blue part of light by the colloidal particles. The scattering is caused if the size of particles is of the order of wavelength of light. The same effect is not observed when the light is passed through a true solution as the size of solute particles is too small to cause any scattering

 

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