[Au(CN)2]-(aq) → Au+(aq) + 2 CN-(aq)
Au+ → Au (gain 1 electrons → reduction)
Zn → Zn2+ (lose 2 electrons → oxidation)
Gold is isolated from rocks by reaction with aqueous cyanide, CN-:
4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l) → 4 Na[Au(CN)2](aq) + 4 NaOH(aq)
The [Au(CN)2]- ion can be converted back to Au(0) by reaction with Zn(s) powder. Write a balanced chemical equation for this reaction.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Coordination Complexes concept. You can view video lessons to learn Coordination Complexes. Or if you need more Coordination Complexes practice, you can also practice Coordination Complexes practice problems.