Gold is isolated from rocks by reaction with aqueous cyanide, CN - : 4 Au(s) + 8
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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a The Au atoms from Aus are being oxidized while the Na atoms from NaCNaq are bei...View the full answer
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Related Book For 
Chemistry The Central Science
ISBN: 978-0134414232
14th Edition
Authors: Theodore Brown, H. LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward, Matthew Stoltzfus
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