Chemical and electrochemical behaviour in molten alkali hydroxides

Claes, P.; Dewilde, Y.; Glibert, Jacques

doi:10.1016/0022-0728(88)85174-x

Cited by 8 publications

(2 citation statements)

References 42 publications

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“…Acido-basic properties of the melts.--The melt preparation was described in earlier papers (5,6). All the determinations were carried out at 483 K in the case of the eutectic mixture and at 623 K in the case of pure sodium hydroxide.…”

Section: Ca(oh)2--> Cao + H20mentioning

confidence: 99%

“…Equation [1] relates the water concentration (CH2o) to its partial pressure (PH2o) in the gas phase PH20 = kH20" CH20 [1] The Henry coefficient kn2o used in this work was determined by Hoyt (10) and yields 195 mm Hg.M -1 at 623 K. This value is in excellent agreement with controls carried out in our laboratory. Details on the experimental device and on the electrochemical measurements were provided in previous papers (5,6).…”

Section: Ca(oh)2--> Cao + H20mentioning

confidence: 99%

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Chemical and Electrochemical Behavior in Molten Alkali Hydroxides: III . Chemistry of Tin (II) and (IV) in the Eutectic Mixture and in Pure

Claes

Peeters

Glibert

1989

J. Electrochem. Soc.

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This paper describes the chemical behavior of tin (II) and (IV) in the eutectic mixture normalNaOH‐KOH (49M%) at 483 K and in molten normalNaOH at 623 K. Sn(II) is unstable in molten hydroxides and is oxidized by the solvent. The oxidation of normalSnO occurs either directly in the solid phase or after dissolution as SnO22− . Basic conditions promote the liquid phase oxidation. Sn(IV) dissolves as SnO32− in the eutectic mixture. Soluble in basic melts, it is only slightly soluble in acidic melts and precipitates as Na2SnO3 false(normals=6.8+0.6×10−4Mfalse) at water concentrations <4.10−2 M and as a mixture of SnO2 and Na2SnO3 in more acidic media. Sn(IV) is practically insoluble in acidic sodium hydroxide false(normals<10−6Mfalse) and precipitates as Na2SnO3 . It dissolves in basic melts as SnO44− false(s<10−3Mfalse) , Na4SnO4 being precipitated from saturated solutions.

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Section: Ca(oh)2--> Cao + H20mentioning

confidence: 99%

Section: Ca(oh)2--> Cao + H20mentioning

confidence: 99%

Chemical and Electrochemical Behavior in Molten Alkali Hydroxides: III . Chemistry of Tin (II) and (IV) in the Eutectic Mixture and in Pure

Claes

Peeters

Glibert

1989

J. Electrochem. Soc.

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Mesures de Conductivité Et de Coefficients de Diffusion Dans Les Mélanges Eau ‐ Hydroxyde de Sodium

Claes

Wakenge

Gilbert

1993

Bulletin des Soc Chimique

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SUMMARYMeasurements of conductivity and diffusion constants were carried out in H20-NaOH mixtures at NaOH mole fractions ranging from 0.02 to 0.6 (tmax -200°C). Equivalent conductance isotherms and diffusion isotherms of the Tc103~-and Pb0Z2-ions do not show any particular occurrence when the corresponding activation energy values exhibit a broad maximum at about XN~OH = 0.3 and a sharper maximum at QaoH = 0.5. This last composition corresponds to the NaOH.1 H20 distectic. A transition in the mechanism of conductance in molten NaOH hydrates from the proton transfer mechanism to the hydrodynamic mechanism can be suggested.

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ChemInform Abstract: Chemical and Electrochemical Behavior in Molten Alkali Hydroxides. Part 2. Electrochemistry of Chalcogenide Ions in the Molten NaOH + KOH (49 mol%) Eutectic Mixture.

1988

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ChemInform Abstract In molten NaOH/KOH, the chalcogenide ions are electrochemically oxidized to chalcogenites as shown in the scheme; the corresponding values referred to the lower limit of the electrochemical window are 1.87 V (S2-), 1.71 V (Se2-), and 1.47 V (Te2-). In the case of sulfide, the formation of disulfide at a lower potential yields a well defined hump in the voltammetric peak at 483 K, which disappears at 623 K due to the instability of disulfide at higher temperatures. Owing to their lower stability, diselenide ions are produced only in solutions with high Se2-concentration. Ditelluride ions are not detected under the conditions used.

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Chemical and electrochemical behaviour in molten alkali hydroxides

Cited by 8 publications

References 42 publications

Chemical and Electrochemical Behavior in Molten Alkali Hydroxides: III . Chemistry of Tin (II) and (IV) in the Eutectic Mixture and in Pure

Chemical and Electrochemical Behavior in Molten Alkali Hydroxides: III . Chemistry of Tin (II) and (IV) in the Eutectic Mixture and in Pure

Mesures de Conductivité Et de Coefficients de Diffusion Dans Les Mélanges Eau ‐ Hydroxyde de Sodium

ChemInform Abstract: Chemical and Electrochemical Behavior in Molten Alkali Hydroxides. Part 2. Electrochemistry of Chalcogenide Ions in the Molten NaOH + KOH (49 mol%) Eutectic Mixture.

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