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SAI INTERNATIONAL SCHOOL
                                                       CLASS- VI
                                               SUBJECT- CHEMISTRY
                                   TOPIC –SEPARATION OF SUBSTANCES
                 SUB-TOPIC- SOLUBILITY AND SOLUTIONS, WATER- A UNIVERSAL
                                                         SOLVENT


                                                   LESSON NOTES

               Soluble and Insoluble Substances
               Substances that dissolve in a liquid are known as soluble substances.

               Example: salt, sugar, copper sulphate


               Substances that do not dissolve in a liquid are known as insoluble substances.

               Example: sand, gravel, chalk.

               Solvent: A solvent is a substance, generally a liquid, in which other materials dissolve.
               For example, water.

               Solute: A solute is a substance that is dissolved in a solvent to form a solution. For
               example, sugar.


               Solution: A mixture of the solute and solvent forms the solution. For example, sugar
               dissolves in water to form sugar solution.


               Solubility: The ability of a substance to dissolve in water to form a solution is called the
               solubility of that substance in water.

               The solubility of solids in liquids generally increase with increase in temperature and
               with stirring.

               Saturated solution: A solution that cannot dissolve any more solute in it is called a
               saturated solution.

               Unsaturated solution: An unsaturated solution is one which can dissolve more solute
               at a particular temperature.


               WATER- A UNIVERSAL SOLVENT

               Water is known as the Universal Solvent because it is capable of dissolving a variety of
               different substances.

               This property of water is very important for every living organism on earth.






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