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Problem: 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)Which atoms from which compounds are being oxidized, and which atoms from which compounds are being reduced?

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Remember the mnemonics:

Loss                Gain

Electrons         Electrons

Oxidation         Reduction


Reaction:

4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)  →  4 Na[Au(CN)2](aq) + 4 NaOH(aq)

Recall the rules for the oxidation states of some elements

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Problem Details

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)

Which atoms from which compounds are being oxidized, and which atoms from which compounds are being reduced?

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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 Redox Reactions concept. If you need more Redox Reactions practice, you can also practice Redox Reactions practice problems.