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[20.100] Gold exists in two common positive oxidation states, +1 and +3. The standard reduction potentials for these oxida- tion states are Au*(aq) + e¯ - Au(s) Ered = +1.69 V Au** (aq) + 3 e – Au(s) Eed = +1.50 V (a) Can you use these data to explain why gold does not tar- nish in the air? (b) Suggest several substances that should be strong enough oxidizing agents to oxidize gold metal. (c) Miners obtain gold by soaking gold-containing ores in an aqueous solution of sodium cyanide. A very soluble com- plex ion of gold forms in the aqueous solution because of the redox reaction 4 Au(s) + 8 NaCN(aq) + 2 H,O(1) + O;(g) 4 Na[Au(CN);](aq) + 4 NaOH(aq) What is being oxidized and what is being reduced in this reac- tion? (d) Gold miners then react the basic aqueous product solution from part (c) with Zn dust to get gold metal. Write a balanced redox reaction for this process. What is being oxi- dized, and what is being reduced?

[20.100] Gold exists in two common positive oxidation states, +1 and +3. The standard reduction potentials for these oxida- tion states are Au*(aq) + e¯ - Au(s) Ered = +1.69 V Au** (aq) + 3 e – Au(s) Eed = +1.50 V (a) Can you use these data to explain why gold does not tar- nish in the air? (b) Suggest several substances that should be strong enough oxidizing agents to oxidize gold metal. (c) Miners obtain gold by soaking gold-containing ores in an aqueous solution of sodium cyanide. A very soluble com- plex ion of gold forms in the aqueous solution because of the redox reaction 4 Au(s) + 8 NaCN(aq) + 2 H,O(1) + O;(g) 4 Na[Au(CN);](aq) + 4 NaOH(aq) What is being oxidized and what is being reduced in this reac- tion? (d) Gold miners then react the basic aqueous product solution from part (c) with Zn dust to get gold metal. Write a balanced redox reaction for this process. What is being oxi- dized, and what is being reduced?

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter19: Electrochemistry
Section: Chapter Questions
Problem 19.104QP
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[20.100] Gold exists in two common positive oxidation states, +1 and +3. The standard reduction potentials for these oxida- tion states are Au*(aq) + e Au(s) Eed = +1.69 V > Au*(ag) + 3 e → Au(s) Ered = +1.50 V (a) Can you use these data to explain why gold does not tar- nish in the air? (b) Suggest several substances that should be strong enough oxidizing agents to oxidize gold metal. (c) Miners obtain gold by soaking gold-containing ores in an aqueous solution of sodium cyanide. A very soluble com- plex ion of gold forms in the aqueous solution because of the redox reaction 4 Au(s) + 8 NaCN(aq) + 2 H,O(1) + O2(g) 4 Na[Au(CN),](aq) + 4 NaOH(aq) > What is being oxidized and what is being reduced in this reac- tion? (d) Gold miners then react the basic aqueous product solution from part (c) with Zn dust to get gold metal. Write a balanced redox reaction for this process. What is being oxi- dized, and what is being reduced?
Transcribed Image Text:[20.100] Gold exists in two common positive oxidation states, +1 and +3. The standard reduction potentials for these oxida- tion states are Au*(aq) + e Au(s) Eed = +1.69 V > Au*(ag) + 3 e → Au(s) Ered = +1.50 V (a) Can you use these data to explain why gold does not tar- nish in the air? (b) Suggest several substances that should be strong enough oxidizing agents to oxidize gold metal. (c) Miners obtain gold by soaking gold-containing ores in an aqueous solution of sodium cyanide. A very soluble com- plex ion of gold forms in the aqueous solution because of the redox reaction 4 Au(s) + 8 NaCN(aq) + 2 H,O(1) + O2(g) 4 Na[Au(CN),](aq) + 4 NaOH(aq) > What is being oxidized and what is being reduced in this reac- tion? (d) Gold miners then react the basic aqueous product solution from part (c) with Zn dust to get gold metal. Write a balanced redox reaction for this process. What is being oxi- dized, and what is being reduced?
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