Using the electrochemical series, which one of the following changes to the electrolysis cell may reduce the amount of Ni electroplated onto the Pt electrode?
A - VCE - SSCE Chemistry - Question 21 - 2021 - Paper 1
Question 21
Using the electrochemical series, which one of the following changes to the electrolysis cell may reduce the amount of Ni electroplated onto the Pt electrode?
A. rep... show full transcript
Worked Solution & Example Answer:Using the electrochemical series, which one of the following changes to the electrolysis cell may reduce the amount of Ni electroplated onto the Pt electrode?
A - VCE - SSCE Chemistry - Question 21 - 2021 - Paper 1
Step 1
A. replacing the Ni electrode with a Cu electrode
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Answer
Replacing the Ni electrode with a Cu electrode will likely reduce the amount of Ni deposited on the Pt electrode. This is because Cu is less reactive compared to Ni in the electrochemical series, which implies that Ni ions may not deposit efficiently from a solution with a less reactive electrode.
Step 2
B. replacing Ni(NO₃)₂(aq) with 1 M Ni(NO₃)₂(aq)
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Answer
Replacing Ni(NO₃)₂(aq) with a 1 M concentration of the same salt will not reduce the amount of Ni electroplated. An increase in concentration typically leads to a higher rate of electroplating since there are more Ni²⁺ ions available for reduction.
Step 3
C. replacing the Pt electrode with Pb(s)
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Answer
Replacing the Pt electrode with Pb(s) may lower the efficiency of Ni electroplating since Pb has a different electrode potential compared to Pt, and may not provide the necessary conditions for effective deposition of nickel.
Step 4
D. replacing Ni(NO₃)₂(aq) with NiCl₂(l)
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Answer
Replacing Ni(NO₃)₂(aq) with NiCl₂(l) will not significantly reduce Ni deposition. While the chemical form changes, both sources provide Ni²⁺ ions for reduction, maintaining the overall electroplating process.
