Application of the tetraphenylarsonium tetraphenylborate (TATB) assumptionto the hydration entropies of ions

The hydration entropy of ions is calculated from their entropy in the ideal gaseous state and the standard entropy of their aqueous solutions. The app lication of the tetraphenylarsonium tetraphenylborate (TATB) and the cognat e tetraphenylphosphonium tetraphenylborate (TPTB) assumptions in obtaining the latter is explored, using newly determined heat capacity data for cryst alline tetraphenyl phosphonium and arsonium perchlorates, their redetermine d solubility data, both over a temperature interval, and data from the lite rature. The results are compared with those based on the widely accepted es timate of the standard entropy of the aqueous hydrogen ion based on thermoc ell data. (C) 2000 Academic Press.