The pKa of an acid can be used as an indicator of its strength. It is defined as the negative logarithmic dissociation constant of the acid, with a base-10. This value is directly proportional to the standard Gibbs free energy change, indicating the thermodynamic stability of the acid. Therefore, acids with lower pKa values are considered stronger, while those with higher values are weaker. This relationship between pKa and Gibbs free energy change is fundamental and is widely used in various fields of chemistry.Could you provide the pKa value of this molecule in its negative form?