What is acids? Give any two examples.
Acids are those chemical substances that gives hydrogen ions when dissolved in water.
For example: HCl -----> H+ + Cl-
H2SO4 -----> 2H+ + SO4--
Why are acid sour in taste, but bases are bitter?
We know, acids are acidic in nature but base are basic in nature. Acids contains hydrogen ions (H+) which stimulate the taste buds that detect sour taste. Bases contain (OH-)ions which stimulate the taste buds that detects bitter taste. Therefore, acids are sour in taste but bases are bitter.