Solution is a homogeneous mixture of two or more substances.
Aqueous solution is formed by dissolving substances in water.
The component which is lesser in quantity is called solute and the component in greater quantity is called solvent.
A solution containing less amount of solute than that is required to saturate it at a given temperature is called unsaturated solution.
A solution that is more concentrated than that of a saturated solution is called as supersaturated solution at that particular temperature.
Solution may be dilute or concentrated depending upon the quantity of dissolved solute in solution.
Concentration of solutions are expressed as % w/w, % w/v, % v/w and % v/v.
The practical unit of concentration is molarity. It is the number of moles of solute dissolved in one dm3 of solution.
Solubility is defined as the number of grams of the solute dissolved in 100 g of solvent to prepare a saturated solution at a given temperature . It depends upon solute-solvent interactions and temperature.
Colloidal solutions are false solutions and in these solutions particles are bigger than in the true solutions.