O=c1cc(/N=N\c2ccc(Cl)c(Cl)c2)[nH]c(=O)[nH]1
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?