Dissocitates only slightly in water and only a small fraction of acid molecules produce hydrogen ions.
A weak acid has weak donating power.
Eg: acetic acid (CH3COOH)
Strong acid: Completely dissociates in water to form hydrogen ions and conjugate base.
Produces a much high concentration of hydrogen ions.
A strong acid has high donating power.
Eg: hydrochloric acid (Hcl), nitric acid (HNO3)
The difference:
- Degree of dissociation: Weak acids dissociate only partially, while strong acids dissociate completely.
- Equilibrium: Weak acids reach an equilibrium state where both dissociated and undissociated molecules coexist, while strong acids completely dissociate and no undissociated molecules remain.
- Hydrogen ion concentration: Weak acids produce a lower concentration of hydrogen ions compared to strong acids at the same concentration.
- pH value: Solutions of weak acids have a higher pH value than solutions of strong acids at the same concentration.
- Corrosiveness: Strong acids are generally more corrosive than weak acids due to their high hydrogen ion concentration.
- Reactivity: Strong acids are more reactive and participate in chemical reactions more readily due to their higher concentration of hydrogen ions.
