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SAI International School
                                                       Class-X

                                               Subject_ Chemistry
                                          Topic- Acids, Bases & Salts
                                   Sub Topic- Concept of Acids & Bases

                                                  LESSON NOTES


                   A.  Common Man’s concept of Acids & Bases-
                     ACIDs- Acids are substances that are sour to taste and corrosive in
                       nature.
                     Bases- Bases are substances that are bitter to taste and slippery to touch.


                   B.  Arrhenius concept of acids and bases-
                     ACIDS- Acids are those substances which liberate H+ (hydronium) ions in
                       their aqueous medium.
                                                 +         -
                          HCl   +   H 2O      H 3O    +   Cl
                                                             (Hydronium ion)
                     BASES- Bases are those substances which liberate OH- (hydroxyl) ion in
                       their aqueous medium.
                                                  +         -
                             NaOH   +   H2O    Na  +2 (OH )










































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