Plot of thermodynamically stable phases of an aqueous electrochemical system
Pourbaix diagram of iron.[1] The Y axis corresponds to voltage potential.
In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, EH–pH diagram or a pE/pH diagram, is a plot of possible thermodynamically stable phases (i.e., at chemical equilibrium) of an aqueous electrochemical system. Boundaries (50 %/50 %) between the predominant chemical species (aqueous ions in solution, or solid phases) are represented by lines. As such a Pourbaix diagram can be read much like a standard phase diagram with a different set of axes. Similarly to phase diagrams, they do not allow for reaction rate or kinetic effects. Beside potential and pH, the equilibrium concentrations are also dependent upon, e.g., temperature, pressure, and concentration. Pourbaix diagrams are commonly given at room temperature, atmospheric pressure, and molar concentrations of 10−6 and changing any of these parameters will yield a different diagram.
The diagrams are named after Marcel Pourbaix (1904–1998), the Russian-born Belgian chemist who invented them.
generally in solution chemistry, a Pourbaixdiagram, also known as a potential/pH diagram, EH–pH diagram or a pE/pH diagram, is a plot of possible thermodynamically...
solution are related by the Nernst equation as commonly represented by a Pourbaixdiagram ( E h {\displaystyle E_{h}} – pH plot). E h {\displaystyle E_{h}} explicitly...
A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since prehistoric times on walls of caves...
is unstable and will disproportionate (see diagram above). Frost diagramPourbaixdiagram Ellingham diagram Atkins, Peter; Overton, Tina (2010). "5. Oxidation...
available for oxidation or reduction. The notion of pe is used with Pourbaixdiagrams. pe is a dimensionless number and can easily be related to EH by the...
achievement is the derivation of potential-pH, better known as “PourbaixDiagrams”. PourbaixDiagrams are thermodynamic charts constructed using the Nernst equation...
diagram should be aware of the problem, and should always be clearly informed on which free-energy scale their diagrams are based. Pourbaixdiagram Ellingham...
given in the table of standard electrode potential. Nernst equation Pourbaixdiagram Solvated electron Standard electrode potential (data page) Standard...
arsenites are the main arsenic species in anoxic waters with a low pe. A Pourbaixdiagram shows the combined influence of pH and pe on arsenate speciation. Arsenates...
Pourbaixdiagram for copper in uncomplexed media (anions other than OH- not considered). Ion concentration 0.001 m (mol/kg water). Temperature 25 °C....
rebar is passivated and is protected from corrosion. According to the Pourbaixdiagram for iron, the metal is passive when the pH is above 9.5. The carbon...
volt/ pH unit delimiting the lower stability region of water in a Pourbaixdiagram where gaseous hydrogen is evolving because of water decomposition....
Olowe, Ph. Refait, and L. Simon (1996): "On the stoichiometry and Pourbaixdiagram of Fe(II)-Fe(III) hydroxy-sulphate or sulphate-containing green rust...
water-soluble. The interactions of carbonate anions with uranium(VI) cause the Pourbaixdiagram to change greatly when the medium is changed from water to a carbonate...
Boehler, Reinhard (2000). "High-pressure experiments and the phase diagram of lower mantle and core materials". Reviews of Geophysics. 38 (2). American...
isolation in electrical/electronic circuits Galvanic series Galvanization Pourbaixdiagram – Plot of thermodynamically stable phases of an aqueous electrochemical...
under basic conditions. This can be illustrated by means of a Pourbaixdiagram (Eh–pH diagram) drawn using the Nernst equation and the corresponding redox...
principle. Lead(II) sulfate is poorly soluble, as can be seen in the following diagram showing addition of SO2− 4 to a solution containing 0.1 M of Pb2+. The...
obtain Mg is lower than the stability domain of water on an Eh–pH diagram (Pourbaixdiagram). MgCl2 → Mg + Cl2 The production of metallic magnesium at the...
Nanoelectrochemistry Photoelectrochemistry Plasma electrochemistry Pourbaixdiagram Protein film voltammetry Reactivity series Redox titration Standard...
water-soluble. The interactions of carbonate anions with uranium(VI) cause the Pourbaixdiagram to change greatly when the medium is changed from water to a carbonate...
solution becomes more basic and this relationship is described by the PourbaixDiagram. All the above parameters are responsible for controlling side product...
Pourbaixdiagram for water, including equilibrium regions for water, oxygen and hydrogen at STP. The vertical scale is the electrode potential of hydrogen...
at any pH (see Pourbaixdiagram for bromine at http://www.eosremediation.com/download/Chemistry/Chemical%20Properties/Eh_pH_Diagrams.pdf ), but it is...
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