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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, E H –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.
Au 3+ + 3 e − → Au: 1.5: 2.54: 223 Platinum ... The simplified entries in the reaction column can be read in detail from the Pourbaix diagrams of the considered ...
Marcel Pourbaix (16 September 1904 – 28 September 1998) was a Belgian chemist and pianist. [citation needed] He performed his most well known research at the University of Brussels, studying corrosion. [1] His biggest achievement is the derivation of potential-pH, better known as “Pourbaix Diagrams”.
The platinum-group metals [a] (PGMs) are six noble, precious metallic elements clustered together in the periodic table. These elements are all transition metals in the d-block (groups 8, 9, and 10, periods 5 and 6). [1] The six platinum-group metals are ruthenium, rhodium, palladium, osmium, iridium, and platinum.
Pourbiax diagrams will show the phases that a material will take in an aqueous environment, based on electrical potential and pH. The brain maintains a pH of around 7.2 to 7.4, and from the Pourbaix diagram of platinum [ 3 ] it can be seen that at around 0.8 volts Pt at the surface will oxidize to PtO 2 , and at around 1.6 volts, PtO 2 will ...
F is the Faraday constant (the charge per mole of electrons), equal to 96,485.3 coulomb·mol −1 p 0 is the standard pressure : 1 bar = 10 5 Pa Note : as the system is at chemical equilibrium , hydrogen gas, H 2 (g) , is also in equilibrium with dissolved hydrogen, H 2 (aq) , and the Nernst equation implicitly takes into account the Henry's ...
Similar to Pourbaix diagrams for the speciation of redox species as a function of the redox potential and the pH, ionic partition diagrams indicate in which phase an acid or a base is predominantly present in a biphasic system as a function of the Galvani potential difference between the two phases and the pH of the aqueous solution.
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