Instructions: Select a metal, set the molality m of the aqueous species, and specify the limits of the axes (make sure min < max). The step defines the position of the labels on the axes. The default system is Cu-H₂O at m = 10^-6 and 298.15 K. Click on Calculate to generate the diagram.

EpH-Web generates one-metal isothermal Eh vs. pH (Pourbaix) diagram for various concentrations (m) of solutes in a dilute aqueous phase. Data are taken from the FACT compound (i.e. pure substances) database.

Here you are limited to one metallic element and a fixed temperature (298.15 K). In the EpH module of the full package, your may enter up to 3 metallic elements (to produce a multi-metallic system) and any temperature. Species may be dropped from the calculation, and the activity or partial pressure of any phase may be set to a value other than unity. In addition to the calculated Pourbaix diagram it is possible to list a table of invariant points, and perform a detailed chemical equilibrium calculation at any coordinate on the diagram. Additional constant chemical potentials may also be specified.