text: Because the relationship pK = pK − pK holds only in aqueous solutions (though analogous relationships apply for other amphoteric solvents), subdisciplines of chemistry like organic chemistry that usually deal with nonaqueous solutions generally do not use pK as a measure of basicity. Instead, the pK of the conjugate acid, denoted by pK, is quoted when basicity needs to be quantified. For base B and its conjugate acid BH in equilibrium, this is defined as
  A higher value for pK corresponds to a stronger base. For example, the values  and  indicate that  (triethylamine) is a stronger base than  (pyridine).