What does Henderson hassalbalch relate pH to kpa
The Henderson-Hasselbalch equation relates the pH of a solution to the pKa value of the acidic component and the ratio of the concentration of the conjugate base to the concentration of the acid. The equation is:
pH = pKa + log([A-]/[HA])
where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.
There is no direct relationship between pH and kpa (kiloPascals), as kPa is a unit of pressure, not concentration. The Henderson-Hasselbalch equation specifically relates pH to concentrations of acid and its conjugate base in a solution.