On the vapor pressure of sulfuric acid

Abstract

The vapor pressure of H 2 SO 4 over 98.01 mass‐% sulfuric acid solution has been determined experimentally over the temperature interval 338 to 445 K. Values of the enthalpy and entropy changes upon vaporization deduced from the data accord well with other estimates available in the literature. Extrapolation to 99.0 mass‐% and 296.15 K allows us to confirm another recent vapor pressure determination, thereby supporting the conclusion that the vapor pressures most often used in nucleation calculations in the past are as much as an order of magnitude high.