Journal of Solution Chemistry

, Volume 16, Issue 6, pp 443–463 | Cite as

A potentiometric investigation of the hydrolysis of chromate (VI) ion in NaCl media to 175°C

  • Donald A. Palmer
  • D. Wesolowski
  • R. E. Mesmer
Article

Abstract

The hydrolysis of chromate ion was studied potentiometrically in a concentration cell fitted with hydrogen electrodes by titrating basic NaCl−Na2CrO4 solutions with standardized HCl against a NaOH reference solution. The temperature was varied from 25 to 175°C at 25° intervals at the following ionic strengths (I): 0.1140, 0.2346, 0.5337, 0.9988, 2.940, and 5.239 (NaCl). Depending on the ionic strength, the molality of total chromium was varied from 0.001 to 0.100. The resulting titration curves could be resolved best in terms of three equilibria involving the formation of HCrO 4 (aq), Cr2O3− (aq), and CrO3Cl (aq). The equilibrium quotients for all three reactions were fitted as a function of temperature and ionic strength, and the molal thermodynamic parameters that were computed from these relationships are tabulated at specific ionic strengths over the experimental temperature range.

Key words

Chromate equilibrium quotient hydrolysis emf ionic strength thermodynamics 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    H. G. Linge and A. L. Jones,Aust. J. Chem. 21, 2189 (1968).Google Scholar
  2. 2.
    H. G. Linge and A. L. Jones,Aust. J. Chem. 21, 1445 (1968).Google Scholar
  3. 3.
    J. D. Neuss and W. Rieman,J. Am. Chem. Soc. 56, 2238 (1934).Google Scholar
  4. 4.
    Y. Sasaki,Acta Chem. Scand. 16, 719 (1962).Google Scholar
  5. 5.
    J. R. Howard, V. S. K. Nair, and G. H. Nancollas,Trans. Faraday Soc. 54, 1034 (1958).Google Scholar
  6. 6.
    W. D. Davies and J. E. Prue,Trans Faraday Soc. 51, 1045, (1955).Google Scholar
  7. 7.
    J. Y. Tong and E. L. King,J. Am. Chem. Soc. 75, 6180 (1953).Google Scholar
  8. 8.
    J. Y. Tong and R. L. Johnson,Inorg. Chem. 5, 1902 (1953).Google Scholar
  9. 9.
    G. P. Haight Jr., D. C. Richardson, and N. H. Coburn,Inorg Chem. 3, 1777 (1964).Google Scholar
  10. 10.
    L. G. Hepler,Thermochim. Acta 50, 69 (1981).Google Scholar
  11. 11.
    L. G. Hepler,J. Am. Chem. Soc. 80, 6181 (1958).Google Scholar
  12. 12.
    R. Arnek and S. R. Johansson,Acta Chem. Scand. 26, 2903 (1972).Google Scholar
  13. 13.
    G. Michel and R. Machiroux,J. Raman Spect. 14, 23 (1983).Google Scholar
  14. 14.
    G. Michel and R. Cahay,J. Raman Spect. 17, 79 (1986).Google Scholar
  15. 15.
    D. Wesolowski, S. E. Drummond, R. E. Mesmer, and H. Ohmoto,Inorg. Chem. 23, 1120 (1984).Google Scholar
  16. 16.
    R. H. Busey and R. E. Mesmer,J. Chem. Eng. Data 23, 175 (1978).Google Scholar
  17. 17.
    W. H. Hartford,Indust. Eng. Chem. 34, 920 (1942).Google Scholar
  18. 18.
    D. L. Perry and L. Tsao,Earth Sciences 7, 1 (1984).Google Scholar
  19. 19.
    L. E. Towill, C. R. Shriner, J. S. Drury, A. S. Hammons, and J. W. Holleman,Reviews of the Environmental Effects of Pollutants: III. Chromium, ORNL/EIS-80, EPA-600/1-78-023, (1980).Google Scholar
  20. 20.
    F. Ahern, J. M. Eckert, N. C. Payne, and K. L. Williams,Anal. Chim. Acta 175, 147 (1985).Google Scholar
  21. 21.
    R. E. Mesmer, C. F. Baes Jr., and F. H. Sweeton,J. Phys. Chem. 74, 1937 (1970).Google Scholar
  22. 22.
    D. A. Palmer, R. W. Ramette, and R. E. Mesmer,J. Solution Chem. 13, 685 (1984).Google Scholar
  23. 23.
    P. Henderson,Z. Phys. Chem. 59, 118 (1907)63, 325 (1908).Google Scholar
  24. 24.
    A. S. Quist and W. L. Marshall,J. Phys. Chem.,69, 2984 (1964).Google Scholar
  25. 25.
    A. L. Jones and H. G. Linge,Aust. J. Chem 22, 663 (1969).Google Scholar
  26. 26.
    C. F. Baes Jr. and R. E. Mesmer,The Hydrolysis of Cations (Wiley-Interscience, New York, 1976), pp. 18 19.Google Scholar
  27. 27.
    W. R. Busing and H. A. Levy, Oak Ridge Natl. Lab., [Rep.] ORNL-TM (U.S.), ORNL-TM-271 (1963).Google Scholar
  28. 28.
    C. Liu and W. T. Lindsay,J. Solution Chem. 1, 45 (1972).Google Scholar
  29. 29.
    C. S. Patterson, R. H. Busey, and R. E. Mesmer,J. Solution Chem. 13, 647 (1984).Google Scholar

Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • Donald A. Palmer
    • 1
  • D. Wesolowski
    • 1
  • R. E. Mesmer
    • 1
  1. 1.Chemistry DivisionOak Ridge National LaboratoryOak Ridge

Personalised recommendations