Abstract
The molar enthalpies of solution of VOSO4⋅3.52H2O(s) at various molalities in water and in aqueous sulfuric acid (0.1 mol⋅kg−1), Δsol H m, were measured by a solution-reaction isoperibol calorimeter at 298.15±0.01 K. An improved Archer’s method to estimate the standard molar enthalpy of solution, \(\Delta_{\mathrm{sol}}H^{0}_{\mathrm{m}}\), was put forward. In terms of the improved method, the values of \(\Delta_{\mathrm{sol}}H^{0}_{\mathrm{m}}=-24.12\pm 0.03~\mbox{kJ}{\cdot}\mbox{mol}^{-1}\) of VOSO4⋅3.52H2O(s) in water and \(\Delta_{\mathrm{sol}}H^{0}_{\mathrm{m}}=-15.38\pm 0.06~\mbox{kJ}{\cdot}\mbox{mol}^{-1}\) in aqueous sulfuric acid were obtained, respectively. The data indicates that the energy state of VOSO4 in aqueous H2SO4 is higher than that in pure water.
Similar content being viewed by others
References
Sum, E., Rychcik, M., Kazacos, M.S.: Investigation of the V(V)/V(IV) system for use in the positive half-cell of a redox battery. J. Power Sources 16, 85–95 (1985)
Kazacos, M., Cheng, M., Kazacos, M.S.: Vanadium redox cell electrolyte optimization studies. J. App. Electrochem. 20, 463–467 (1990)
Kazacos, M.S., Robins, R.G.: All-vanadium redox battery. US Patent No. 4, 786,567 (1988)
Rahman, F., Kazacos, M.S.: Solubility of vanadyl sulfate in concentrated sulfuric acid solutions. J. Power Sources 72, 105–110 (1998)
Oriji, G., Katayama, Y., Miura, T.: Investigation on V(IV)/V(V) species in a vanadium redox flow battery. Electrochim. Acta 49, 3091–3095 (2004)
Oriji, G., Katayama, Y., Miura, T.: Investigation on V(IV)/V(V) and V(II)/V(III) redox reactions by various electrochemical methods. J. Power Sources 139, 321–324 (2005)
Liu, J.G., Xue, W.F., Qin, Y., Yan, C.W., Yang, J.Z.: Enthalpy of solution for anhydrous VOSO4 and estimated enthalpy of formation reaction for ion pair [VOSO4]0. J. Chem. Eng. Data 54, 1938–1941 (2009)
Archer, D.G., Widegren, J.A., Kirklin, D.R., Magee, J.W.: Enthalpy of solution of 1-octyl-3-methylimidazolium tetrafluoroborate in water and in aqueous sodium fluoride. J. Chem. Eng. Data 50, 1484–1491 (2005)
Li, L.D., Chen, H.S.: The preparation and application of VOSO4. Patent application PCT Appl/CN 02/02133808.6 (2002)
Zhang, Z.F., Li, J.G., Zhang, Q.G., Guan, W., Yang, J.Z.: Enthalpy of solution of amino acid ionic liquid 1-ethyl-3-methylimidazolium ammonioacetate. J. Chem. Eng. Data 53, 1196–1198 (2008)
Yang, J.Z., Zhang, Z.H., Fang, D.W., Li, J.G., Guan, W., Tong, J.: Studies on enthalpy of solution for ionic liquid: the system of 1-methyl-3-ethylimidazolium tetrafluoroborate (EMIBF4). Fluid Phase Equilib. 247, 80–83 (2006)
Rychly, R., Pekarek, V.: The use of Potassiumi Chloride and tris(hydroxymethyl) aminomethane as standard substances for solution calorimetry. J. Chem. Thermodyn. 9, 391–396 (1977)
Montgomery, R.L., Melaugh, R.A., Lau, C.C., Meier, G.H., Chan, H.H., Rossini, F.D.: Determination of the energy equivalent of a water solution calorimeter with a standard substance. J. Chem. Thermodyn. 9, 915–936 (1977)
Pitzer, K.S.: Activity Coefficients in Electrolyte Solutions, 2nd edn. CRC Press, Boca Raton (1991)
Strehlow, H., Wendt, H.: Fast ionic reactions in solution. IV. The formation of the vanadyl sulfate complex in aqueous solution. Inorg. Chem. 2, 6–10 (1963)
Pitzer, K.S., Roy, R.N., Silvester, L.F.: Thermodynamics of electrolytes. 7. Sulfuric acid. J. Am. Chem. Soc. 99, 4930–4936 (1977)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Qin, Y., Xue, WF., Liu, JG. et al. The Estimation of Standard Molar Enthalpies of Solution for VOSO4⋅nH2O(s) in Water and in Aqueous H2SO4 . J Solution Chem 39, 857–863 (2010). https://doi.org/10.1007/s10953-010-9544-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10953-010-9544-7