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Redox pivots

Redox pivots. Databases treating redox reactions must include either O 2 ( aq ) or H 2 ( aq ) in the list of Basis Species. This species is the database’s “redox pivot”. O 2 ( aq ) is the redox pivot in thermo.tdat.

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Redox pivots

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  1. Redox pivots

  2. Databases treating redox reactions must include either O2(aq) or H2(aq) in the list of Basis Species. This species is the database’s “redox pivot”. O2(aq) is the redox pivot in thermo.tdat

  3. The reaction for the “free electron” must be written in terms of the redox pivotor its gaseous form. When O2(aq) is the redox pivot, the electron must be balanced in terms of O2(aq) or O2(g). Alternatively, if H2(aq) is the redox pivot, the electron can be balanced in terms of H2(aq) or H2(g).

  4. Redox coupling reactions must be balanced in terms of the redox pivot, its gaseous form, or the free electron. When O2(aq) is the redox pivot, redox coupling reactions must be balanced in terms of O2(aq), O2(g), or the e−. Fe+++, H2(aq), etc. are redox species Alternatively, if H2(aq) is the redox pivot, redox couples must be balanced in terms of H2(aq), H2(g), or the e−.

  5. You can swap the position of Basis and Redox species in the thermo dataset. Exchange the positions of O2(aq) and H2(aq). H2(aq) is the new redox pivot, and O2(aq) becomes a redox species.

  6. Redox coupling reactions are automatically rebalanced in terms of the new redox pivot H2(aq).

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