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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