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Solution may be defined as homogeneous mixture of two or more pure substances, the relative ratio of which can be varied within certain limits. It is possible to dissolve different amounts of a solute in a given quantity of a solvent to obtain solutions of different concentrations. Solutions can be divided into two classes depending upon the amounts of solute dissolved in a given amount of solvent :-
Test for Saturation and Unsaturation:
To test whether a solution is saturated or unsaturated, we add more solute to the solution and stir it thoroughly. If the solute dissolves, the solution is unsaturated. If it remains undissolved, the solution is saturated.