O=C(O)c1ccccc1/N=N\c1c(O)c(S(=O)(=O)O)cc2cc(S(=O)(=O)[O-])ccc12.[Na+]
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?