During this electrolysis, the pH of the solution will
A - VCE - SSCE Chemistry - Question 6 - 2003 - Paper 1
Question 6
During this electrolysis, the pH of the solution will
A. decrease around the cathode and increase around the anode.
B. increase around the cathode and decrease aroun... show full transcript
Worked Solution & Example Answer:During this electrolysis, the pH of the solution will
A - VCE - SSCE Chemistry - Question 6 - 2003 - Paper 1
Step 1
A. decrease around the cathode and increase around the anode.
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Answer
This statement is correct. During electrolysis, reduction occurs at the cathode, where hydroxide ions (OH−) are produced, leading to an increase in pH and a more alkaline solution. Conversely, oxidation occurs at the anode, where hydrogen ions (H+) are produced, leading to a decrease in pH and a more acidic solution.
Step 2
B. increase around the cathode and decrease around the anode.
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Answer
This is also a true statement. The pH increases around the cathode due to hydroxide ion formation, while it decreases around the anode because of hydrogen ion formation.
Step 3
C. decrease at both electrodes.
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Answer
This statement is incorrect. The pH will not decrease at both electrodes, as the cathode experiences an increase in pH due to hydroxide formation.
Step 4
D. increase at both electrodes.
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Answer
This statement is also incorrect. While the cathode sees an increase in pH, the anode experiences a decrease in pH due to the formation of hydrogen ions.
