General Awareness is a very important subject in competitive exam. As we can score maximum marks in minimum time. Today we are sharing short notes on Solubility and Colloidal solution. So guys don't miss it and read it carefully
SOLUBILITY & COLLOIDAL SOLUTION
Solubility: The amount of solute dissolved in 100 gm of a solvent to form a saturated solution at a given temperature, is called its solubility.
Effect of Temperature on Solubility
The solubility of substances increases with increase in temperature but in some cases, the solubility of substances such CaO, CaCO3, CaSO4 decreases with increase in temperature because their dissolution takes place with the evolution of heat.
Dissolution of NaOH takes place with evolution of heat but its solubility increases with the increase in temperature,
The solubility of gases in water decreases with the increase in temperature because their dissolution takes place with the evolution of heat.
COLLOIDAL SOLUTION
* A colloidal solution is a heterogeneous system in which one substance is dispersed as very fine particles in another substance, called dispersion medium. For colloidal particles range of diameters is between 1nm to 100nm. A solution of soaps or detergents in water at higher concentration is a colloidal solution.
* Colloidal solution is a stable solution because colloidal particles do not settle down when left undisturbed. The scattering of beam of visible light by colloidal particles is called Tyndall effect.
Types of Colloidal Solutions
Colloidal Solution Around Us
Clouds: These are aerosols having small droplets of water suspended in the air.
Blue Colour of the sky: Dust particles along with water suspended in air, scatter blue light which reaches our eyes and the sky appears blue to us.
Blood: A colloidal solution of an albuminoid. The stoppage of bleeding by applying ferric chloride solution is due to the formation of blood clot.
Delta formation: It is a colloidal solution of clay.
Emulsion: These are the colloids in which the dispersed phase, as well as the dispersion medium both, are liquids, e.g. milk, cod liver oil.
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