Abstract
The heat of neutralization of solutions by was measured at 25°C for various mole ratios of to . These data, with the two dissociation constants of , allow calculation of the free energies, heats of formation, and the partial molal entropies of S−− and . The results for S−− and are, respectively : , , and . The potential of the S−− ‒ S couple is 0.447 volt.