Chem March 24 2014 Redox review 1 A reaction between Hydrogen and Fluorine takes place. Which one is oxidized and which one is reduced? The reaction between hydrogen and fluorine is an example of an oxidationreduction reaction: H 2 +F 2 → 2 HF The overall reaction may be written as two halfreactions: H 2 → 2H + + 2e − (the oxidation reaction) E= 0.00V F 2 + 2e − → 2F − (the reduction reaction) E= 2.87V There is no net change in charge in a redox reaction so the excess electrons in the oxidation reaction must equal the number of electrons consumed by the reduction reaction. The ions combine to form hydrogen fluoride: H 2 +F 2 → 2H + + 2F − → 2HF E = 0.00V + 2.87V= 2.87V