1. ACIDS BASES SALTS

2. Sour in taste Converts blue litmus red Colourless in phenolphthalein

3. ORGANIC ACIDS Obtained from plants and animals These are weak acids, acetic acid MINERAL ACIDS Obtained from minerals These are generally strong acids,eg HCl.

4.  Acids are the substances which can give hydrogen ion in aqueous solution.  HCl (aq) H+ + Cl-  H 2 SO 4 (aq) 2H+ + Cl-

5. More to learn about acids  Acids are good conductor of electricity as they can give hydrogen ion in aqueous solution.  Acids are colourless in aqueous solution.  Acids give red colour with methyl orange.