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class-12____sub-chemistry
_______chapter-Solutions
Answers
Solutions are homogeneous mixtures. Different types of solutions have solvents and solutes in different phases. Solutes are dissolved in the solvent. In a solution in which carbon dioxide is dissolved in water, the water is the solvent and the carbon dioxide is the solute.
On the Basis of Water as Solvent
Based on the whether the solvent is water or not, solutions are of two types.
Aqueous solutions: These solutions have water as the solvent. Examples of such solutions are sugar in water, carbon dioxide in water, etc.Non-Aqueous Solutions: These solutions have a solvent that is not water. It could be ether, benzene, petrol, carbon tetrachloride etc. Common examples include sulfur in carbon disulphide, naphthalene in benzene, etc.On the Basis of the Amount of Solute Added
Based on the amount of solute present in the solution, we can classify them into the following types.
Unsaturated Solution: An unsaturated is one that can dissolve more solute at a definite temperature. It means that we can still add more solute to the solvent.Saturated Solution: A solution is said to be saturated when we can’t add any more solute to the solvent. This means that the solution can’t dissolve any more solute at a definite temperature.Supersaturated Solution: A supersaturated solution is one where the solute is present in an excess amount. This solute is dissolved forcefully by raising the temperature or pressure of the solution. These generally crystal out in the bottom by the method called crystallisation.