Journal of Solution Chemistry

, Volume 7, Issue 12, pp 915–930 | Cite as

Acid dissociation of hexaamminemetal nitrates in liquid ammonia

  • S. Balt
  • W. de Kieviet
Article

Abstract

The proton dissociation of hexaamminemetal nitrates of Cr(III), Co(II), Co(III), Ni(II), and Cu(II) in liquid ammonia has been investigated at a temperature of −39°C. This could be realized by using a specially constructed thin-walled glass electrode combined with a Ag/Ag(I) (in liquid ammonia) reference electrode. The potential of the couple used has been found to obey the Nernst equation in liquid ammonia. The pKa values of the hexaamminemetal nitrates in liquid ammonia are 7.27 [Cr(III)], 6.99 [Co(II)], 7.78 [Co(III)], 8.95 [Ni(II)], and 8.24 [Cu(II)]. The temperature dependence of the pKavalues falls within the experimental error.

Key words

pH acid dissociation liquid ammonia glass electrode in liquid ammonia reference electrode Ag/Ag(I) in liquid ammonia hexaamminechromium(III) nitrate hexaamminecobalt(II) nitrate hexaamminecobalt(III) nitrate hexaamminenickel(II) nitrate hexaamminecopper(II) nitrate 

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Copyright information

© Plenum Publishing Corporation 1978

Authors and Affiliations

  • S. Balt
    • 1
  • W. de Kieviet
    • 1
  1. 1.Department of Inorganic ChemistryFree UniversityAmsterdamThe Netherlands

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