a weak acid ha has a pka of 4691 if a solution of, Biology

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a weak acid ha has a pka of 4691 if a solution of

A weak acid (HA) has a pKa of 4.691. If a solution of this acid has a pH of 4.920, what percentage of the acid is not ionized? (Assume all H in solution came from the ionization of HA.)

Can someone please help with this problem as in what formula to use and solve it.

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