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A mixture of two or more substances can be a solution, a suspension or a colloid. The substance is said to be in a state of molecular dispersion when the particles of a pure substance are of molecular atomic or ionic size. A solution is a homogenous molecular dispersion of two or more substances. It can also be stated that a solution is homogenous mixture of two or more substances. Homogeneous means uniform throughout. Thus a solution which is a homogeneous mixture will have a uniform composition throughout.

Sugar solution is a clear liquid and we cannot distinguish the sugar particles from the water molecules even with the microscope. Some of the examples of solutions are salt solution, sugar solution, copper sulphate solution and solution of acetic acid in water, which is vinegar.

The liquid in which the substance is dissolved is called a solvent. The substance which dissolves in a solvent to produce a solution is called solute. In sugar solution, sugar is a solute whereas water in which it is dissolved is called solvent. Generally in any solution the amount of solute present is lower than that of a solvent.



Why should we prepare a solution?


From the above discussion, in a solution, solute and solvent are present in molecular or ionic forms. When two solid substances are kept in contact the reaction is slow and sometimes invisible. But when their solutions are mixed, a reaction takes place at a faster rate due to close mixing of two reacting substances at molecular level. Hence it is advantageous to use solutions in various industrial processes and in medicines which are absorbed easily in the blood.


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