O=C(C[n+]1ccc(C=NO)cc1)N(Cc1ccccc1)Cc1ccccc1.[Cl-]
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?