Oc1ccccc1-[n+]1c(-c2ccccc2)cc(-c2ccccc2)cc1-c1ccccc1.[O-][Cl+3]([O-])([O-])[O-]
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?