Letter | Published:

The Limiting Mobilities of some Monovalent Ions and the Dissociation Constant of Acetic Acid at 25°

Naturevolume 130page435 (1932) | Download Citation

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Abstract

MACINNES, Shedlovsky, and Longsworth 1 claim to have obtained accurate figures for the limiting mobilities of certain monovalent ions, inter alia, K+, 73.50; Na+, 50.10; H+, 349.72; Cl-, 76.32; CH3COO-, 40.87 ; and they refer to the discrepancies between these and the older figures compiled by Noyes and Falk.2 We would point out that all these constants, except that for the acetate, were determined by us some time ago,3 and were based on the use of the Ferguson and Vogel method4 for extrapolation to infinite dilution and a value of 0.490 for the cation transport number for potassium chloride ; our figures are K+, 73.4 ; Na+, 49.8 ; H+, 348.0 ; Cl-, 76.4, that for the hydrogen ion being based on conductivity measurements of iodic, hydrochloric, and benzenesulphonic acids in dilute solution in silica cells.

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References

  1. 1

    J. Amer. Chem. Soc., 54, 2761; 1932.

  2. 2

    J. Amer. Chem. Soc., 34, 454; 1912.

  3. 3

    J. Chem. Soc., 1751; 1931: 400; 1932

  4. 4

    Phil. Mag., 50, 971; 1925.

  5. 5

    J. Amer. Chem. Soc., 54, 1429; 1932.

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Author information

Affiliations

  1. Woolwich Polytechnic, London, S.E.18.

    • A. I. VOGEL
  2. University College, Southampton

    • G. H. JEFFERY

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https://doi.org/10.1038/130435a0

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