The pKa of an acid, which is defined as the negative base-10 logarithmic dissociation constant, is a parameter that is determined by the thermodynamics underlying the acid's behavior. Specifically, the pKa is directly proportional to the standard Gibbs free energy change associated with the acid's dissociation process.Could you please inform me regarding the protonation/deprotonation equilibrium of the given molecule by providing its pka value?