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Transference numbers of potassium picrate in water at 25°C and the dimerization of picrate ions

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Abstract

The cation- and anion-constituent transference numbers of aqueous 0.02M potassium picrate have been measured at 25°C by the moving-boundary method. The large difference (0.014) between the results and the predictions of the Debye-Hückel-Onsager theory, and similar anomalies in the literature, are consistent with the existence of picrate ion dimers (Pi 2 2− ) with a formation constant of 4(±2) liter-mole−1.

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Author information

Correspondence to M. Spiro.

Additional information

This work was carried out at Imperial College while P. G. N. Moseley was on leave of absence from the University of Khartoum.

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Moseley, P.G.N., Spiro, M. Transference numbers of potassium picrate in water at 25°C and the dimerization of picrate ions. J Solution Chem 1, 39–43 (1972). https://doi.org/10.1007/BF00648415

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Key Words

  • Transference number
  • moving boundary
  • potassium picrate
  • dimerization
  • aqueous