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Volume 67, 1971
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Solubility of cadmium chloride and the standard potential of the cadmium electrode in formamide

Abstract

The e.m.f. of the cell, Cd : Hg(2-phase amalgam)/CdCl2(m)/AgCl/Ag, where m is the number of moles of anhydrous CdCl2 per kg of formamide and lies in the range 0 < m < 0.02 has been measured at 298.15 K. The measurements are analyzed in terms of complex formation in solution to yield a value of the molal standard potential of the Cd2+/Cd electrode of –0.412 V at 298.15 K. By combining this value with the standard potential of the Cd/CdCl2(s)/Cl electrode,1 where CdCl2(s) denotes a solid solvate of composition CdCl2· 2½HCONH2, the solubility product of cadmium chloride in formamide is calculated to be 2 × 10–7(mol kg–1)3. The solubility of anhydrous cadmium chloride in formamide has also been measured at 288.15 K, 298.15 K and 308.15 K using a radiochemical technique. The results suggest extensive complex formation in formamide, the dominant species being the CdCl2–4 ion.

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Article type: Paper
DOI: 10.1039/TF9716700128
Citation: Trans. Faraday Soc., 1971,67, 128-131
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    Solubility of cadmium chloride and the standard potential of the cadmium electrode in formamide

    A. W. Andrews, D. A. Armitage, R. W. C. Broadbank, K. W. Morcom and B. L. Muju, Trans. Faraday Soc., 1971, 67, 128
    DOI: 10.1039/TF9716700128

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