Tin metal is electroplated onto sheets of iron using a tin anode and a well-stirred solution containing Sn²⁺ ions - VCE - SSCE Chemistry - Question 7 - 2006 - Paper 1
Question 7
Tin metal is electroplated onto sheets of iron using a tin anode and a well-stirred solution containing Sn²⁺ ions.
During this process
A. the anode increases in mas... show full transcript
Worked Solution & Example Answer:Tin metal is electroplated onto sheets of iron using a tin anode and a well-stirred solution containing Sn²⁺ ions - VCE - SSCE Chemistry - Question 7 - 2006 - Paper 1
Step 1
A. the anode increases in mass.
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Answer
In the electroplating process, the tin anode is oxidized. Tin atoms from the anode lose electrons and enter the solution as Sn²⁺ ions, meaning the anode actually decreases in mass rather than increases.
Step 2
B. Sn²⁺ ions move towards the cathode.
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Answer
During the electroplating process, Sn²⁺ ions in the solution are attracted towards the cathode due to the electric field created by the voltage applied in the system. This movement is driven by the reduction reaction occurring at the cathode.
Step 3
C. the concentration of Sn²⁺ in the solution decreases.
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Answer
As Sn²⁺ ions move toward the cathode and get reduced to tin metal, the concentration of Sn²⁺ ions in the solution decreases over time as they are deposited onto the iron sheets.
Step 4
D. the concentration of Sn²⁺ in the solution increases.
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Answer
Conversely, the concentration of Sn²⁺ ions does not increase; in fact, it decreases as tin is deposited during the electroplating process.
