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?
Method Method Redox reactions are generally balanced using two processes. The first method is based on the redox reaction’s division into two reactions where one is involved in oxidation and the other in reduction (half reaction method) and the second one is based on the reducing and oxidizing molecule’s oxidation number variation (oxidation number method).
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