When gold ores are leached with CN2 solutions, gold forms a complex ion, Au(CN)2 2. (a)
Chapter 22, Problem 22.68(choose chapter or problem)
When gold ores are leached with CN2 solutions, gold forms a complex ion, Au(CN)2 2. (a) Find Ecell for the oxidation in air (PO2 5 0.21) of Au to Au1 in basic (pH 13.55) solution with [Au1] 5 0.50 M. Is the reaction Au1(aq) 1 e2 - Au(s), E8 5 1.68 V, spontaneous? (b) How does formation of the complex ion change E8 so that the oxidation can be accomplished?
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