Three types of solutions can be classified on the basis of concentration of solute – 

1. Saturated solution – at a definite temperature, when the value of the amount of substance that can be dissolved in a solvent reaches its maximum value (called saturation point) such that no more solute can be dissolved, such solutions are said to be saturated solutions. Cold drinks, carbonated water and soda are examples of saturated solutions of carbon dioxide and water.

2. Unsaturated solution – an unsaturated solution is a solution in which a solvent can dissolve more solute, that is, the solution hasn’t reached its saturation point. Examples include lemon juice in lemonade.

3. Supersaturated solution – when the saturation point is increased by increasing temperature, to dissolve more solute by force, such solutions are called supersaturated solutions. For example, a supersaturated solution is sodium acetate.