What are the differences between strong and weak acids?

Question

Accepted Answer

Basis of differentiation

Strong acid

Weak acid

Definition

Strong acids are molecules which completely dissociate into their ions in aqueous solutions

Weak acids are molecules which partially dissociate into ions in aqueous solutions

pH

The pH of a strong acid solution is very low (around 0-1)

The pH of a weak acid is typically 3-5

Release of H+ ions

Strong acids release all the H+ ions into the solution

Weak acids do not release all H+ ions

Acid dissociation

The acid dissociation constant is a higher value

The acid dissociation constant is a comparatively lower value

Correlation with pKa value

The stronger the acid, the lower the pKa value is

The weaker an acid, the higher its pKa value

Acid type

Strong acids are polyprotic (capable of losing more than a single proton)

Weak acids are monoprotic (are capable of donating only one proton)

Basis of differentiation	Strong acid	Weak acid
Definition	Strong acids are molecules which completely dissociate into their ions in aqueous solutions	Weak acids are molecules which partially dissociate into ions in aqueous solutions
pH	The pH of a strong acid solution is very low (around 0-1)	The pH of a weak acid is typically 3-5
Release of H+ ions	Strong acids release all the H+ ions into the solution	Weak acids do not release all H+ ions
Acid dissociation	The acid dissociation constant is a higher value	The acid dissociation constant is a comparatively lower value
Correlation with pKa value	The stronger the acid, the lower the pKa value is	The weaker an acid, the higher its pKa value
Acid type	Strong acids are polyprotic (capable of losing more than a single proton)	Weak acids are monoprotic (are capable of donating only one proton)