Thermodynamics of sulphuric acid: apparent and partial molar heat capacities and volumes of aqueous HSO–4 from 10–55 °C and calculation of the second dissociation constant to 350 °C
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 86 (16) , 2831-2839
- https://doi.org/10.1039/ft9908602831
Abstract
Apparent molar heat capacities and volumes of aqueous solutions containing H2SO4 have been determined from 10 to 55°C. These results are complicated by the presence of bisulphate and sulphate ions as well as effects due to chemical relaxation. Consideration of these contributions has led to derived standard-state partial molar heat capacities and volumes for HSO– 4 over the stated temperature range. The heat capacity and volume data, which are related to Gibbs free energies by derivatives with respect to temperature and pressure, have been used along with a semi-theoretical model to calculate equilibrium constants for the dissociation of bisulphate to 350°C. Results of these calculations are in good agreement with the best equilibrium data presently available.Keywords
This publication has 51 references indexed in Scilit:
- Heat capacities and volumes of dissociation of phosphoric acid (1st, 2nd, and 3rd), bicarbonate ion, and bisulfate ion in aqueous solutionCanadian Journal of Chemistry, 1982
- A bibliography of sources of experimental data leading to thermal properties of binary aqueous electrolyte solutionsPublished by National Institute of Standards and Technology (NIST) ,1979
- Thermodynamics of electrolytes. 7. Sulfuric acidJournal of the American Chemical Society, 1977
- Calorimetrically determined log K, ΔH°, and ΔS° values for the interaction of sulphate ion with H+, Na+, and K+in the presence of tetra-n-alkylammonium ionsJ. Chem. Soc. A, 1969
- Second Dissociation Constant of Sulfuric Acid from 25 to 350° Evaluated from Solubilities of Calcium Sulfate in Sulfuric Acid Solutions1,2The Journal of Physical Chemistry, 1966
- THE BISULFATE ACID CONSTANT FROM 25 TO 225° AS COMPUTED FROM SOLUBILITY DATA1The Journal of Physical Chemistry, 1961
- The Thermodynamic Properties of Aqueous Sulfuric Acid Solutions and Hydrates from 15 to 300°K.1Journal of the American Chemical Society, 1960
- Aqueous Sulfuric Acid. Heat Capacity. Partial Specific Heat Content of Water at 25 and -20°1Journal of the American Chemical Society, 1952
- Heat Capacity and Density of Aqueous Solutions of Potassium Iodate, Potassium Acid Sulfate, Iodic Acid, and Sulfuric Acid at 25°C.The Journal of Physical Chemistry, 1941
- The Heats of Ionization of Water, Ammonium Hydroxide, Carbonic, Phosphoric, and Sulfuric Acids. The Variation of Ionization Constants with Temperature and the Entropy Change with IonizationJournal of the American Chemical Society, 1937