O=[N+]([O-])c1ccc(Cl)c(/C=C/c2cc(C(F)(F)F)nc(O)n2)c1
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?