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Any chemically and physically homogeneous mixture of two more substances is said to be solution. It is possible to have solution of solids in liquids, liquids in liquids, gases in liquids, solids in solids, etc.
Depending upon the size of the dispersed particles we recognize true solution, colloidal solution and suspensions.
If sugar is dissolved in water and the ultimate sugar particle is of molecular dimensions then a thru solution is formed. On the other hand, if very fine sand is mixed with water, consisting of many molecules, then a colloidal solution is formed.
From the pharmaceutical point of view solutions of solid in liquid are the greatest importance.
The extent of solubility of different substance varies, but it has a constant value at constant temperature.
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