The Effects of Ionic Strength on Polytungstate Ions Equilibrium in KCl Solution

다중텅그스텐산 이온평형에 대한 이온세기의 영향. 염화칼륨용액에서

  • 안상운 (전북대학교 문리과대학 화학과)
  • Published : 1974.06.30

Abstract

The effects of ionic strength on the polynucleation reaction of tungstate ions and the protonized reaction of polytungstate ions have been investigated in the range of ionic strength from 1 M to 4 M KCl.The hexatungstate ions and the protonized forms of hexatungstate ions are formed in the tungstate solutions whose ionic strengths are 1 M to 4 M KCl. The equilibrium constants for the formation of hexatungstate ions and the protonized forms of hexatungstate ions are calculated in the range of ionic strength from 1 M to 4M KCl. The enthalpy changes for the formation of hexatungstate ions and the protonized forms of hexatungstate ions are as follows; $7H^++{6WO_4}^{2-}={HW_6O_{21}}^{5-}+3H_2O\;\;{\Delta}H^{\circ}=-62.4{\pm}0.6$$H^++{HW_6O_{21}}^{5-}={H_2W_6O_{21}}^{4-}\;\;{\Delta}H+_1^{\circ}=-4.12{\pm}0.10$$H^++{H_2W_6O_{21}}^{4-}={ H_3W_6O_{21}}^{3-}\;\;{\Delta}H_2^{\circ}=-4.36{\pm}0.30$ The free energy and entropy changes for the above reactions have been also calculated. A linear relation is formed between $log k_{6,7}$ and ionic strength, and $log k_1\;or\;log k_2\;vs{\cdot}{\mu}.$ $log k_{6,7}\;=\;D{\mu}+I,\;\;where\;D\;=\;1.66{\pm}0.02$$log k_1\;=\;D_1{\mu}+I_1,\;\;where\;D_1\;=\;-8.065{\pm}0.001$$log k_2\;=\;D_2{\mu}+I_2,\;\;where\;D_2\;=\;-0.376{\pm}0.006$

Keywords

References

  1. Prog. Inorg. Chem. v.4 Kepert
  2. C. R. Acad. Sci. Sar. C. v.170 Pierre(et al.)
  3. Z. Inorg. Allgem. Chem. v.187 Jander(et al.)
  4. J. Chem. Soc. A. Jain(et al.)
  5. Act. Chem. Scad. v.15 Sasaki
  6. Z. Naturforcsh v.8 Tykto;Glemser
  7. Inorg. Chem. v.11 Honing;Kustin
  8. Kolloid Z. Z. Polymer v.249 Plewinsky
  9. J. Chem. Soc. Ducan;Kepert
  10. Act. Chem. Scand. v.22 Arnak
  11. Act. Chem. Scand. v.11 Ingri(et al.)
  12. Act. Chem. Scand. v.10 Rossotti;Rossotti
  13. J. Korean Chem. Soc. v.17 S. Ahn;E. Park
  14. Natural Sci. v.14 Chon Puk N. Univ. Thesas Collection S. Ahn
  15. Determination of Stability Constant Rossotti;Rossotti
  16. Determination of Stability Constant Rossotti;Rossotti
  17. Thermedynamics Lewis;Randall
  18. Act. Chem. Scand. v.23 Amek
  19. Act. Chem. Scand. v.13 Ingri;Brito
  20. J. Chem. Ed. v.44 Rasmussen
  21. Proc. Roy. Soc. v.144 Keggin
  22. Inorg. Chem. v.8 Kepert
  23. Physical Chemistry v.1 Eyring(et al.)
  24. Act. Chem. Scand. v.8 Sillen
  25. Inorg. Chem. v.3 Aveston
  26. Inorg. Chem. v.3 Aveston(et al.)
  27. Quantative Analysis Fischer;Paters
  28. Act. Chem. Scand. v.8 Sillen
  29. Bureau of Mine Report of Investigation 6845 Churchward;Bridges, R. I.
  30. J. Amer. Chem. Soc. v.75 Block;McIntrye