Gold exists in two common positive oxidation states, +1and +3. The standard reduction potentials for these oxidationstates areAu+(aq) + e- ----->Au(s) E°red = +1.69 VAu3+(aq) + 3 e- ------>Au(s) E°red = +1.50 V (a) Can you use these data to explain why gold does not tarnishin the air? (b) Suggest several substances that shouldbe strong enough oxidizing agents to oxidize gold metal.(c) Miners obtain gold by soaking gold-containing oresin an aqueous solution of sodium cyanide. A very solublecomplex ion of gold forms in the aqueous solution becauseof the redox reaction4 Au(s) + 8 NaCN(aq) + 2 H2O(l) + O2(g)----->4 Na[Au(CN)2](aq) + 4 NaOH(aq)What is being oxidized, and what is being reduced in thisreaction? (d) Gold miners then react the basic aqueousproduct solution from part (c) with Zn dust to get goldmetal. Write a balanced redox reaction for this process.What is being oxidized, and what is being reduced?
Gold exists in two common positive oxidation states, +1and +3. The standard reduction potentials for these oxidationstates areAu+(aq) + e- ----->Au(s) E°red = +1.69 VAu3+(aq) + 3 e- ------>Au(s) E°red = +1.50 V (a) Can you use these data to explain why gold does not tarnishin the air? (b) Suggest several substances that shouldbe strong enough oxidizing agents to oxidize gold metal.(c) Miners obtain gold by soaking gold-containing oresin an aqueous solution of sodium cyanide. A very solublecomplex ion of gold forms in the aqueous solution becauseof the redox reaction4 Au(s) + 8 NaCN(aq) + 2 H2O(l) + O2(g)----->4 Na[Au(CN)2](aq) + 4 NaOH(aq)What is being oxidized, and what is being reduced in thisreaction? (d) Gold miners then react the basic aqueousproduct solution from part (c) with Zn dust to get goldmetal. Write a balanced redox reaction for this process.What is being oxidized, and what is being reduced?
Gold exists in two common positive oxidation states, +1and +3. The standard reduction potentials for these oxidationstates areAu+(aq) + e- ----->Au(s) E°red = +1.69 VAu3+(aq) + 3 e- ------>Au(s) E°red = +1.50 V (a) Can you use these data to explain why gold does not tarnishin the air? (b) Suggest several substances that shouldbe strong enough oxidizing agents to oxidize gold metal.(c) Miners obtain gold by soaking gold-containing oresin an aqueous solution of sodium cyanide. A very solublecomplex ion of gold forms in the aqueous solution becauseof the redox reaction4 Au(s) + 8 NaCN(aq) + 2 H2O(l) + O2(g)----->4 Na[Au(CN)2](aq) + 4 NaOH(aq)What is being oxidized, and what is being reduced in thisreaction? (d) Gold miners then react the basic aqueousproduct solution from part (c) with Zn dust to get goldmetal. Write a balanced redox reaction for this process.What is being oxidized, and what is being reduced?
Gold exists in two common positive oxidation states, +1 and +3. The standard reduction potentials for these oxidation states are Au+(aq) + e- ----->Au(s) E°red = +1.69 V Au3+(aq) + 3 e- ------>Au(s) E°red = +1.50 V
(a) Can you use these data to explain why gold does not tarnish 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 complex ion of gold forms in the aqueous solution because of the redox reaction 4 Au(s) + 8 NaCN(aq) + 2 H2O(l) + O2(g) ----->4 Na[Au(CN)2](aq) + 4 NaOH(aq) What is being oxidized, and what is being reduced in this reaction? (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 oxidized, and what is being reduced?
Definition Definition Chemical reactions involving both oxidation and reduction processes. During a redox reaction, electron transfer takes place in such a way that one chemical compound gets reduced and the other gets oxidized.
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