Abstract
We have measured enthalpies of dilution of aqueous sulfamic acid solutions at 25°C and used results of these measurements to calculate the standard enthalpy of ionization of sulfamic acid. The average ΔH 01on obtained in this work was 735±200 J-mol−1. We have also measured enthalpies of solution of crystalline sulfamic acid in water at 25°C. The results from both measurements are combined with some earlier results from Wu and Hepler to obtain a ‘best value’ for the standard enthalpy of solution, ΔH 0S =19.2±0.2 kJ-mol−1.
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References
E. J. King and G. W. King,J. Am. Chem. Soc. 74, 1212 (1952).
H. P. Hopkins, C.-H. Wu, and L. G. Hepler,J. Phys. Chem. 69, 2244 (1965).
R. L. Benoit, D. Boulet, and M. Frechette,Can. J. Chem. 66, 3038 (1988).
E. M. Woolley, J. O. Hill, W. K. Hannan, and L. G. Hepler,J. Solution Chem. 7, 385 (1978).
L. G. Hepler and H. P. Hopkins,Rev. Inorg. Chem. 1, 303 (1979)
J. W. Larson,J Phys. Chem. 74, 3392 (1970).
D.D. Wagman,The NBS Tables of Chemical Thermodynamic Properties, J. Phys. Chem. Ref. Data 11, Supplement No. 2 (1982).
D. J. Eatough, J. J. Christensen, and R. M. Izatt,Experiments in Thermometric Titrimentry and Titration Calorimetry (Brigham Young University Press, Provo, Utah, 1974).
V. B. Parker,Nat. Stand. Ref. Data Ser., Nat. Bur. Stds. 2 (U. S. Government Printing Office, Washington, DC, 1965).
J. L. Kurz and J. M. Farrar,J. Am. Chem. Soc. 91, 6057 (1969).
C.-H. Wu and L. G. Hepler,J. Chem. Eng. Data 7, 536 (1962).
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Xu, Y., Yan, HK. Thermodynamics of ionization of aqueous sulfamic acid, an almost-strong electrolyte. J Solution Chem 22, 919–926 (1993). https://doi.org/10.1007/BF00646603
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DOI: https://doi.org/10.1007/BF00646603