Question

Differentiate between strong acid and weak acid. Name two examples each.

Answer 1

Strong acid       Weak acidA strong acid is completely (100%) ionized.
A strong acid has a pH  1.
EX: Hydrochloric acid , sulphuric acid.
HCl(aq)          H+(aq)       +          Cl-(aq) 
All of the HCl molecules becomes into hydrogen ions & chloride  ions when they  are  dissolved in water.


 A weak acid is only partly (less than 100%) ionized.
pH of weak acid is 3-5
EX: Acetic acid, Formic acid
CH3COOH(aq)           H+(aq)       +      CH3COO-(aq)
Some of the ethanoic acidmolecules  become ions.most of them stay as ethanoic acid molesules.