Vapor pressures of aqueous solutions of (Ag,Tl, Cs)NO3 at 98.5°C

Vapor pressure measurements have been made by the static method on the system (Ag, Tl, Cs)NO₃+H₂O in the water-poor region at 98.5°C. The Ag/Tl ratio was maintained at 1.06, and the cesium content of the melt was varied between 2.5 and 10 mole %. The water activity data for each series conformed to a form of the B.E.T. equation adapted to electrolyte solutions. The B.E.T. constants changed in a regular manner as Cs replaced Ag/Tl in the melt, and also conformed to the simple additivity rules previously found to hold in similar systems [(Ag, Tl, M)NO₃+H₂O (M=Ca or Cd)]. The relative capacity for hydration of CsNO₃ and other salts is discussed briefly with reference to the B.E.T. constants and Henry's law constants for water dissolved in molten salt.To whom correspondence should be addressed.