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34. Value of standard electrode potential for the oxidation of CI ions is more
chloride, why is CI oxidised at anode instead of water?
positive than that of water, even then in the electrolysis of ag/fgus sodium?
chloride, why is CI oxidised at anode instead of water?
positive than that of water, even then in the electrolysis of ag/fgus sodium?
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34. Value of standard electrode potential for the oxidation of CI ions...
Electrolysis of Sodium Chloride Solution
During the electrolysis of sodium chloride (NaCl) solution, it is important to understand the competing reactions at the anode and cathode, particularly why chloride ions (Cl⁻) are oxidized instead of water (H₂O).
Standard Electrode Potentials
- The standard electrode potential (E°) for the oxidation of chloride ions to chlorine gas (Cl₂) is approximately +1.36 V.
- For the oxidation of water to oxygen gas (O₂), the E° is around +1.23 V.
- Since the E° for Cl⁻ is more positive, it signifies that Cl⁻ is a stronger oxidizing agent than water.
Reaction Conditions
- In the electrolysis process, the anode is where oxidation occurs.
- Despite the higher potential of Cl⁻, the actual conditions (concentration, pH) in the electrolysis setup influence which species gets oxidized.
Competing Reactions
- At the anode, two possible reactions are:
- 2 Cl⁻ → Cl₂ + 2 e⁻ (oxidation of chloride ions)
- 2 H₂O → O₂ + 4 H⁺ + 4 e⁻ (oxidation of water)
Preference for Chloride Ion Oxidation
- Chloride ions are present in higher concentration than water in the brine solution, making their oxidation more favorable.
- The overpotential for chlorine evolution is lower than that for oxygen evolution, making Cl⁻ oxidation kinetically more favorable.
Conclusion
- Therefore, in the electrolysis of sodium chloride solution, chloride ions are preferentially oxidized at the anode due to their higher concentration and favorable reaction conditions, despite having a higher standard electrode potential than water.
During the electrolysis of sodium chloride (NaCl) solution, it is important to understand the competing reactions at the anode and cathode, particularly why chloride ions (Cl⁻) are oxidized instead of water (H₂O).
Standard Electrode Potentials
- The standard electrode potential (E°) for the oxidation of chloride ions to chlorine gas (Cl₂) is approximately +1.36 V.
- For the oxidation of water to oxygen gas (O₂), the E° is around +1.23 V.
- Since the E° for Cl⁻ is more positive, it signifies that Cl⁻ is a stronger oxidizing agent than water.
Reaction Conditions
- In the electrolysis process, the anode is where oxidation occurs.
- Despite the higher potential of Cl⁻, the actual conditions (concentration, pH) in the electrolysis setup influence which species gets oxidized.
Competing Reactions
- At the anode, two possible reactions are:
- 2 Cl⁻ → Cl₂ + 2 e⁻ (oxidation of chloride ions)
- 2 H₂O → O₂ + 4 H⁺ + 4 e⁻ (oxidation of water)
Preference for Chloride Ion Oxidation
- Chloride ions are present in higher concentration than water in the brine solution, making their oxidation more favorable.
- The overpotential for chlorine evolution is lower than that for oxygen evolution, making Cl⁻ oxidation kinetically more favorable.
Conclusion
- Therefore, in the electrolysis of sodium chloride solution, chloride ions are preferentially oxidized at the anode due to their higher concentration and favorable reaction conditions, despite having a higher standard electrode potential than water.
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34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium?
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34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium?.
34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 34. Value of standard electrode potential for the oxidation of CI ions is morechloride, why is CI oxidised at anode instead of water?positive than that of water, even then in the electrolysis of ag/fgus sodium?.
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