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ELECTROLYSIS OF AN AQUEOUS SOLUTION
[object Object],[object Object]
H + NO 3 -  , OH- Aqueous Solution Salt Ionization Water Ionization Cation Anion  NaCl(aq) NaCl  Na +  + OH- H 2 O  H +  +  OH- Na +  ,  H +   Cl-, OH- CuSO 4 (aq) CuSO 4   Cu 2+  + SO 4 2- H 2 O  H +  + OH- Cu 2+  , H + SO 4 2- , OH- HNO 3 (aq) HNO 3   H +  + NO 3 - H 2 O  H +  + OH-
[object Object],[object Object],Na + Na + Na + OH- OH- OH- NaCl Solution Carbon  Electrode
[object Object],[object Object],[object Object],[object Object]
Position of the ions in the electrochemical series The figure below shows an idealized drawing of a cell in which an aqueous solution of sodium sulphate is electrolyzed Na 2 SO 4 OH- O 2  (g) SO 4 2- H + Na +
Observation Conclusion + Chemical Equation Anode(+): Ion OH- ,[object Object],[object Object],[object Object],Cathode(-): Ion H + ,[object Object],[object Object]
Electrochemical Series ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],F- SO 4 2 - NO 3 - Cl- Br- I- OH- The tendency of cation to discharge increases The tendency of anion to discharge increases
Nature of the Electrode Electrolysis of an aqueous solution of Cuprum Sulphate: Carbon Electrode Cuprum Sulphate Solution Carbon Electrode Anode Cathode
Observation Conclusion + Chemical Equation Anode(+): Ion OH- ,[object Object],[object Object],[object Object],Cathode(-): Ion Cu 2+ ,[object Object],[object Object],[object Object]
Electrolysis of an aqueous solution of Cuprum Sulphate: Cuprum Electrode Cuprum sulphate Solution Cuprum Electrode cathode Anode
Observation Conclusion + Chemical Equation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Concentration of the Ions in Solution KI dilute O 2 (g) Electrode Carbon Electrode Carbon OH- Electrolysis of an aqueous solution of Dilute Potassium Iodide K + I- H +
Observation Conclusion + Chemical Equation Anode(+): Ion OH- ,[object Object],[object Object],[object Object],Cathode(-): Ion H + ,[object Object],[object Object],[object Object]
Electrolysis of an aqueous solution of Concentrated Potassium Iodide Electrode Carbon Electrode Carbon KI I- I 2  (g) H + OH- K +
Observation Conclusion + Chemical Equation Anode(+): Ion I- ,[object Object],[object Object],[object Object],Cathode(-): Ion H + ,[object Object],[object Object],[object Object]
Activity 1
Anode Cathode Electrolyte Electrode Attracted Ion Ionized  Ion Product Attracted Ion Ionized  Ion Product NaCl  (aq)  Dilute Carbon Ions Cl-, OH- Ion OH- O 2  gas Ions Na + , H + Ion H + H 2  gas KCL  (aq)  Concentrated Carbon Ions Cl-, OH- Ion Cl- Cl 2  gas Ions K + ,  H + Ion H + H 2  gas CuBr 2   (aq)   Dilute Carbon Ions Br-, OH- Ion OH- O 2  gas Ions Cu 2+  , H + Ion Cu 2+ Copper metal AgBr 2   (aq)  Concentrated Carbon Ions Br-, OH- Ion Br- Br 2  gas Ion Ag +  ,  H + Ion Ag + Argentum metal NiCl 2   (aq)  Dilute Nikel Ions Cl-, OH- Metal nikel erode Ion Ni 2+ Ion Ni 2+ , H + Ion H + H 2  gas

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6.3 (a) electrolysis of an aqueous solution

  • 1. ELECTROLYSIS OF AN AQUEOUS SOLUTION
  • 2.
  • 3. H + NO 3 - , OH- Aqueous Solution Salt Ionization Water Ionization Cation Anion NaCl(aq) NaCl Na + + OH- H 2 O H + + OH- Na + , H + Cl-, OH- CuSO 4 (aq) CuSO 4 Cu 2+ + SO 4 2- H 2 O H + + OH- Cu 2+ , H + SO 4 2- , OH- HNO 3 (aq) HNO 3 H + + NO 3 - H 2 O H + + OH-
  • 4.
  • 5.
  • 6. Position of the ions in the electrochemical series The figure below shows an idealized drawing of a cell in which an aqueous solution of sodium sulphate is electrolyzed Na 2 SO 4 OH- O 2 (g) SO 4 2- H + Na +
  • 7.
  • 8.
  • 9. Nature of the Electrode Electrolysis of an aqueous solution of Cuprum Sulphate: Carbon Electrode Cuprum Sulphate Solution Carbon Electrode Anode Cathode
  • 10.
  • 11. Electrolysis of an aqueous solution of Cuprum Sulphate: Cuprum Electrode Cuprum sulphate Solution Cuprum Electrode cathode Anode
  • 12.
  • 13. Concentration of the Ions in Solution KI dilute O 2 (g) Electrode Carbon Electrode Carbon OH- Electrolysis of an aqueous solution of Dilute Potassium Iodide K + I- H +
  • 14.
  • 15. Electrolysis of an aqueous solution of Concentrated Potassium Iodide Electrode Carbon Electrode Carbon KI I- I 2 (g) H + OH- K +
  • 16.
  • 18. Anode Cathode Electrolyte Electrode Attracted Ion Ionized Ion Product Attracted Ion Ionized Ion Product NaCl (aq) Dilute Carbon Ions Cl-, OH- Ion OH- O 2 gas Ions Na + , H + Ion H + H 2 gas KCL (aq) Concentrated Carbon Ions Cl-, OH- Ion Cl- Cl 2 gas Ions K + , H + Ion H + H 2 gas CuBr 2 (aq) Dilute Carbon Ions Br-, OH- Ion OH- O 2 gas Ions Cu 2+ , H + Ion Cu 2+ Copper metal AgBr 2 (aq) Concentrated Carbon Ions Br-, OH- Ion Br- Br 2 gas Ion Ag + , H + Ion Ag + Argentum metal NiCl 2 (aq) Dilute Nikel Ions Cl-, OH- Metal nikel erode Ion Ni 2+ Ion Ni 2+ , H + Ion H + H 2 gas