Question

Consider the reaction Upper A u (upper O upper H) subscript 3 plus upper H upper I right arrow upper A U plus upper I subscript 2 plus upper H subscript 2 upper O..

Label the half-reactions as oxidation (use “O”) or reduction (use “R”).

2 upper i right arrow upper I subscript 2 plus 2 e superscript minus.
4
Upper A u superscript plus 3, plus 3 e superscript minus right arrow upper A u.
9

Answer 1

2 I^- → I2 + 2 e^- : O (oxidation — iodide loses electrons)

Au^3+ + 3 e^- → Au : R (reduction — gold(III) gains electrons)