“Solubility of a substance may be defined as the amount of solute dissolved in  100gms of a solvent to form a saturated solution at a given temperature”. A saturated solution is a solution which contains at a given temperature as much solute as it can hold in presence of dissolveding solvent. Any solution may contain less solute than would be necessary to saturate it. Such a solution is known as unsaturated solution. When the solution contains more solute than would be necessary to saturate it then it is termed as supersaturated solution.

Kinds of Solutions

All the three states of matter (gas, liquid or solid) may behave either as solvent or solute. Depending on the state of solute or solvent, mainly there may be following nine types of binary solutions.


GasGasMixture of gases, air.
GasLiquidWater vapours in air, mist.
GasSolidSublimation of a solid into a gas, smoke.
LiquidGasCO2 gas dissolved in water (aerated drinks).
LiquidLiquidMixture of miscible liquids, e.g., alcohol in water.
LiquidSolidSalt in water, sugar in water.
SolidGasAdsorption of gases over metals; hydrogen over palladium.
SolidLiquidMercury in zinc, mercury in gold, CuSO4.5H2O.
SolidSolidHomogeneous mixture of two or more metals (alloys), e.g., copper in gold, zinc in copper.

Among these solutions the most significant type of solutions are those which are in liquid phase and may be categorised as, 

(1) Solid in liquid solutions,

(2) Liquid in liquid solutions and       

(3) Gas in liquid solutions.

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