A hydrogen electrode study of concentrated alkaline aluminate solutions

P. Sipos, Glenn Hefter, Peter M. May

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Abstract

A detailed study of highly concentrated aqueous alkaline aluminate solutions has been made by hydrogen electrode potentiometry in cells with liquid junction at 25°C in 8 M Na(ClO4) media. Measurements were performed over the total concentration ranges 0.1 M <[NaOH]T <4-0 M and 0.02 M <[AlIII]T <3.2 M, and at total concentration ratios of 6.92 ≥ [OH-]T/[AlIII]T ≥ 4.3. Nernstian electrode behaviour was observed at [NaOH]T ≤ c. 2 M in pure NaOH/NaClO4 mixtures. At low [AlIII]T the data were consistent with the formation of only the well known Al(OH)4-(aq) species but there is clear evidence of a systematic release of hydroxide as [AlIII]T and [NaOH]T increase. The data are consistent with the formation of polymeric aluminate complexes having a stoichiometry of Alq(OH)3q-rr+= (q = 4-7, q + r = 1 or 2). However, unequivocal identification of these species is difficult on account of strong correlations in the data and the possible effects of ion-pairing.

Original languageEnglish
Pages (from-to)445-453
Number of pages9
JournalAustralian Journal of Chemistry
Volume51
Issue number6
Publication statusPublished - 1998

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Hydrogen
Electrodes
Stoichiometry
Ions
Liquids
hydroxide ion
sodium perchlorate

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

A hydrogen electrode study of concentrated alkaline aluminate solutions. / Sipos, P.; Hefter, Glenn; May, Peter M.

In: Australian Journal of Chemistry, Vol. 51, No. 6, 1998, p. 445-453.

Research output: Contribution to journalArticle

Sipos, P. ; Hefter, Glenn ; May, Peter M. / A hydrogen electrode study of concentrated alkaline aluminate solutions. In: Australian Journal of Chemistry. 1998 ; Vol. 51, No. 6. pp. 445-453.
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