Q. 214.2( 6 Votes )

Explain why is hydrochloric acid is called, a strong acid and acetic acid, a weak acid? How can it be verified?

Answer :

The strength of acids and bases depends on the number of H+ produced.

i. Acids that give rise to more H+ ions are said to be strong acids and acids that give less H+ ions are said to be weak acids.


ii. Hydrochloric acid (HCl) gives more number of H+ on dissociation:


HCl H+ + Cl-


iii. On the other hand, acetic acid (CH3COOH) gives H+ ions but it is a reversible reaction and thus the ions formed gets to form acetic acid and reaction proceeds in backward direction through a reversible reaction. Due to reversibility, less number of H+ ions are produced:


CH3COOH CH3COO- + H+


iv. Hence, hydrochloric acid is called strong acid and acetic acid is called a weak acid.


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