Gold is isolated from rocks by reaction with aqueous cyanide, CN−: 4Au(s)+8NaCN(aq)+O2(g)+H2O(l)→4Na[Au(CN)2](aq)+4NaOH(aq) The [Au(CN)2]− ion can...
Gold is isolated from rocks by reaction with aqueous cyanide, CN−:
4Au(s)+8NaCN(aq)+O2(g)+H2O(l)→4Na[Au(CN)2](aq)+4NaOH(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.
Homework Answers
Answer:-
The balanced equation for the reaction between [Au(CN)2]- and Zn is given as follows,
2[Au(CN)2]-(aq) + Zn(s) ———> 2Au(s) + [Zn(CN)4]2-(aq)
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Gold is isolated from rocks by reaction with aqueous cyanide,
CN−:
4Au(s)+8NaCN(aq)+O2(g)+H2O(l)→4Na[Au(CN)2](aq)+4NaOH(aq)
The [Au(CN)2]− ion can...
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*7.91. Mining for Gold Gold can be extracted from the surrounding rock using a solution of sodium cyanide. While effective for isolating gold, toxic cyanide finds its way into watersheds, causing environmental damage and harming human health. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) 2 NaAu(CN)2(aq) + Zn(s) → 2 Au(s) + Na [Zn(CN)4](ag) a. If a sample of rock contains 0.009% gold by mass, how much NaCN is needed to...
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Please Help!
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even though there may actually be some single electron transfer
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Now we're ready to balance the redox reaction. To the equation below, first add the product that comes from O3, and then add the correct coefficients in front of the NaOH and the H2O species: XeO3...
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