Diagrammes potentiel—niveau d'acidite dans les milieux H2O_H3PO4—I Systemes electrochimiques ne faisant pas intervenir le proton

Louis, C. Nirmala

doi:10.1016/0039-9140(87)80093-0

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1994

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“…The improvement of the successive stages in the industrial process is possible if the thermodynamic properties such as the activity of water and solvation properties are known (10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

Concentrated Phosphoric Acid Solutions Neutralized by Sodium Hydroxide: Acid-Base, Oxidation-Reduction, and Solvation Properties

Bessière¹,

Tahani²,

Louis³

1994

J. Chem. Eng. Data

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Phosphoric acid solutions progressively neutralized by sodium hydroxide are characterized by means of the Ro(H) (-log aH+) acidity function and the Ro(HzP04-) (-log QPO,-), Ro(HP04%) (-log a~p042-) and Ro(P04%) (-log ape+) functions which represent the aptitude of these solutions to liberate the protons and the H2PO4-, HP042, and PO4% species, respectively. Their solvation properties are characterized by means of the solvationtransfer activity coefficients of the solutes which are calculated from the measured emf of the corresponding redox systems. The behavior of the water activity during the neutralization of 5.5 mol/L phosphoric acid is studied.

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Section: Introductionmentioning

confidence: 99%