The diagram shows a particular cell with relevant half equations - HSC - SSCE Chemistry - Question 27 - 2010 - Paper 1
Question 27
The diagram shows a particular cell with relevant half equations.
Zn(s) + 2OH⁻(aq) → ZnO(s) + H₂O(l) + 2e⁻
HgO(s) + H₂O(l) + 2e⁻ → Hg(l) + 2OH⁻(aq)
Identify th... show full transcript
Worked Solution & Example Answer:The diagram shows a particular cell with relevant half equations - HSC - SSCE Chemistry - Question 27 - 2010 - Paper 1
Identify the anode
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The anode is where oxidation occurs. For this cell, zinc (Zn) is oxidized:
ightarrow ext{ZnO}(s) + ext{H}_2 ext{O}(l) + 2e^-$$Identify the cathode
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The cathode is where reduction occurs. In this case, mercury(II) oxide (HgO) is reduced:
ightarrow ext{Hg}(l) + 2 ext{OH}^-(aq)$$Identify the electrolyte
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The electrolyte used in this cell is potassium hydroxide (KOH) aqueous solution, which allows the movement of hydroxide ions (OH⁻).
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