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 mass... 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 an electroplating process, the tin anode gradually dissolves as tin is deposited onto the iron sheets. Thus, the mass of the anode actually decreases.
Step 2
B. Sn²⁺ ions move towards the cathode.
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Answer
Correct. In electrolysis, cations such as Sn²⁺ ions migrate towards the cathode where they gain electrons and are reduced to form tin metal.
Step 3
C. the concentration of Sn²⁺ in the solution decreases.
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Answer
Incorrect. As Sn²⁺ ions are reduced at the cathode and tin is deposited on the iron, the concentration of Sn²⁺ in the solution will decrease.
Step 4
D. the concentration of Sn²⁺ in the solution increases.
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Answer
Incorrect. The concentration of Sn²⁺ ions in the solution actually decreases as tin metal is formed at the cathode during the plating process.
