Final answer:
To find the dissociation percentage given pKa and pH, use the Henderson-Hasselbalch equation and calculate the concentration of the acid and its conjugate base. Then, divide the concentration of the conjugate base by the initial concentration of the acid and multiply by 100 to obtain the dissociation percentage.
Step-by-step explanation:
To find the dissociation percentage given pKa and pH, you need to calculate the concentration of the acid and its conjugate base, and then use the Henderson-Hasselbalch equation. The Henderson-Hasselbalch equation is pH = pKa + log([A¯]/[HA]), where [A¯] is the concentration of the conjugate base and [HA] is the concentration of the acid. Once you have the concentrations, you can calculate the dissociation percentage by dividing the concentration of the conjugate base by the initial concentration of the acid and multiplying by 100.