Answer:
Balanced half-reaction: Au⁺(aq) → Au³⁺(aq) + 2e⁻.
Gold lost two electrons and change oxidation number from +1 to +3.
Answer: The half reaction for the oxidation of solid gold is written below
Explanation:
Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.
[tex]X\rightarrow X^{n+}+ne^-[/tex]
Reduction reaction is defined as the reaction in which an atom gains electrons. Here, the oxidation state of the atom decreases.
[tex]X^{n+}+ne^-\rightarrow X[/tex]
The half reaction for the oxidation of gold to gold (III) ions follows:
[tex]Au(s)\rightarrow Au^{3+}(aq.)+3e^-[/tex]
Hence, the half reaction for the oxidation of solid gold is written above.
