Enthalpies of Dilution and Excess Molar Enthalpies of an Aqueous Solution of Sulfuric Acid

Abstract

The enthalpies of dilution of the binary system H2SO4 + H2O have been measured at the temperatures of (283.15, 293.15, 313.15, and 333.15) K using two different calorimeters. The excess molar enthalpies, H E, of the system H2SO4 + H2O are obtained from the enthalpies of dilution data. The enthalpies of dilution and the H E data are reported and compared to literature values.

Temperature oscillation calorimetry for the determination of the heat capacity in a small-scale reactor

“…The enthalpies of hydrolysis measured with and without oscillations were 13.19 and 13.79 kJ/mol, respectively. These are 2.3% and 6.9% higher than the values given by Kim and Roth (2001). Thus, the forced temperature oscillations have only a minor impact on the determination of the reaction enthalpy (see Fig.…”

Handling Hydrogen Peroxide Oxidations on a Large Scale: Synthesis of 5-Bromo-2-nitropyridine

“…We performed calorimetric experiments in order to measure the amount of heat released when mixing H 2 SO 4 with either hydrogen peroxide 30% solution or with the same amount of pure water. We then compared the results with calculated values for the hydration of sulfuric acid at different concentrations . By considering the following equation for the formation of Caro’s acid (H 2 SO 5 ): We can calculate the hydration enthalpy in both experiments and compare it with the experimental data (Table ).…”

Rate-Based Modeling and Design of Chlorine Drying Using Sulfuric Acid

“…Figure 3 compares model calculations for the heat of mixing of aqueous mixtures of sulfuric acid in the temperature range of 20−60 °C with the data of Kim and Roth. 18 The model calculations and data have very weak temperature dependence, The agreement between the model and data is good, and therefore, the model may be expected to accurately describe the temperature rise resulting from the absorption of water in aqueous H 2 SO 4 . Figure 4 shows that the calculated liquid heat capacity of H 2 O + H 2 SO 4 solutions at 20 °C agrees well with the data presented in Perry's Handbook.…”

“…Figure compares model calculations for the heat of mixing of aqueous mixtures of sulfuric acid in the temperature range of 20–60 °C with the data of Kim and Roth . The model calculations and data have very weak temperature dependence, and hence, for clarity, the model results are only shown at 40 °C.…”