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Original text

A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.^[1]

Revised text

A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.[1] The half-reactions occur at an electrode of an electrochemical cell, which there are two of in every cell (an anode and a cathode). For oxidation-reduction reactions in acidic conditions, after balancing the atoms and oxidation numbers, one will need to add H+ ions to balance the H ions in the half reaction. For oxidation-reduction reactions in basic conditions, after balancing the atoms and oxidation numbers, first treat it as an acidic solution and then add OH- ions to balance the H+ ions in the half reactions (which would give H2O).

^ Davis, Raymond; Sarquis, Mickey; Frey, Regina; Sarquis, Jerry (2006). "19". Modern Chemistry. Holt, Rinehart, and Winston. pp. 933–935. ISBN 0-03-073546-7. {{cite book}}: |access-date= requires |url= (help)

[modernchemistry-1] Davis, Raymond; Sarquis, Mickey; Frey, Regina; Sarquis, Jerry (2006). "19". Modern Chemistry. Holt, Rinehart, and Winston. pp. 933–935. ISBN 0-03-073546-7. {{cite book}}: |access-date= requires |url= (help)

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