Gold is isolated from rocks by reaction with aqueouscyanide, CN-: 4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)-------->4 Na[Au(CN)2](aq) + 4 NaOH(aq). (a) Which atoms fromwhich compounds are being oxidized, and which atomsfrom which compounds are being reduced? (b) The[Au(CN)2]- ion can be converted back to Au(0) by reactionwith Zn(s) powder. Write a balanced chemical equationfor this reaction. (c) How many liters of a 0.200 M sodiumcyanide solution would be needed to react with 40.0 kg ofrocks that contain 2.00% by mass of gold?
Gold is isolated from rocks by reaction with aqueouscyanide, CN-: 4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)-------->4 Na[Au(CN)2](aq) + 4 NaOH(aq). (a) Which atoms fromwhich compounds are being oxidized, and which atomsfrom which compounds are being reduced? (b) The[Au(CN)2]- ion can be converted back to Au(0) by reactionwith Zn(s) powder. Write a balanced chemical equationfor this reaction. (c) How many liters of a 0.200 M sodiumcyanide solution would be needed to react with 40.0 kg ofrocks that contain 2.00% by mass of gold?
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 68P
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Question
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). (a) Which atoms from
which compounds are being oxidized, and which atoms
from which compounds are being reduced? (b) 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. (c) How many liters of a 0.200 M sodium
cyanide solution would be needed to react with 40.0 kg of
rocks that contain 2.00% by mass of gold?
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