Activity and osmotic coefficients of aqueous sulfuric acid at 298.15 K

Abstract

Articles you may be interested in TES buffer-induced phase separation of aqueous solutions of several water-miscible organic solvents at 298.15 K: Phase diagrams and molecular dynamic simulationsThe activity and osmotic coefficients of aqueous calcium chloride at 298.15 K A critical evaluation of the mean activity coefficient, r + , and osmotic coefficient, ¢>, of aqueous sulfuric acid at 298.15 K is presented for the-molality range of 0 to 28 mol.kg-1 • Osmotic coefficients were calculated from direct vapor pressure measurements, from isopiestic measurements or from freezing point depression measurements. Activity coefficients were calculated from electromotive force measurements of galvanic cells. A least-squares program was used to fit data from all sources using both ¢> and In r ± as functions of molality. A nine parameter equation describes the osmotic coefficient, the mean activity coefficient, and the excess Gibbs energy as a function of the onehalf power of molality. The scientific literature has been covered through January, 1980. Pa (23.767 Torr) (Stimson, 1969, and B T , the second vi rial coefficient for water, vapor, -922 cm 3 .mol-1 from the Steam Tables (Keenan et al ., 1969). Corrections for nonideality of water vapor are given by the second term on the right of eq (1). The gas constant, R, value of 8.31441 J 'moI-1 K -1 was used. The molecular weight of the solvent, M I , and the sum of cations and anions, v, were referenced previously (Staples and Nuttall, 1977).Early measurements of activities of sulfuric acid solu-MOLRLITY IMOL· KG FIGURE 4. Osmotic coefficient vs m l/2 (experimental and calculated).

Variation of Mass Scattering Efficiencies in IMPROVE

“…25 Water was added to the dry particle distributions as a function of RH according to the Zdanovski-Stokes-Robinson relationship using published water activity data. 15,31,32 All components were assumed to be supersaturated below their deliquescence RH. Bsp was estimated from the hourly measured dry size distributions for the dry and ambient RH cases.…”

Determination of Water Activity in Ammonium Sulfate and Sulfuric Acid Mixtures Using Levitated Single Particles

“…From the definition of molality, m, = M J W , where M, is the molar coqcentration of species i in the air (mole/m3 air) and W is the mass concentration of water in the aerosol (kg water/m3 air). The water content is given by, For ammonium sulfate, the water activity estimation formula of Chan et al (1992) is used, and for sulfuric acid the data compiled by Staples (1981) are used.…”

Thermodynamics of Aqueous Sulfuric Acid up to 175 °C

“…Generally, all of these values are in fair agreement. Also shown in ninth column of Table 6 are the values recommended by Staples, who conducted a critical review of published data up to 1980 [37]. There are few activity coefficient values reported for temperatures higher than 60°C to compare with the results obtained here.…”