Question: Problem 1: Construct a potential-pH diagram for Fe-H 2 O system from the following free energy data. Assume standard temperature (298K) and pressure (1 atm/100kPa)
Problem 1: Construct a potential-pH diagram for Fe-H2O system from the following free energy data. Assume standard temperature (298K) and pressure (1 atm/100kPa)
| Species | Std. Free Energy of formation (kJ/mol) |
| Fe | 0 |
| Fe2+ | -78.9 |
| Fe3+ | -4.7 |
| Fe2O3 | -742.2 |
| Fe3O4 | -1015.4 |
| Fe(OH)2+ | -438.0 |
| H2O | -237.1 |
Construct the diagram for dissolved ion concentrations of both 10-3 and 10-6
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