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A potentiometric study on oxalate and citrate complexes of tin(II).

The formation of oxalate and citrate complexes of the Sn2+ ion in 1 M Na(ClO4) at 25 degrees C was investigated in the -log[H+] range 2 to 5 by potentiometric titrations using glass and tin amalgam electrodes. The tin concentration was varied from 0.5 to 5 mM and the concentration of the ligands from 1 to 40 mM. The experimental data have been explained by the formation of the oxalato complexes SnC2O4(aq) and Sn(C2O4)2(2-) and of the citrate complexes (C3H5O7(3-) = citrate ion) SnC3H5O7-, SnHC3H5O7(aq), SnH2C3H5O7+ and Sn(OH)C3H5O7(2-). The equilibrium constants were refined by the computer program SUPERQUAD. The final values of the constants on the medium scale and in the infinite dilution reference state are given in Table 2.[1]

References

  1. A potentiometric study on oxalate and citrate complexes of tin(II). Ciavatta, L., De Tommaso, G., Iuliano, M. Annali di chimica. (2001) [Pubmed]
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