Question
Download Solution PDFIn a mercury cell, zinc-mercury amalgam is used as an anode and carbon is used as a cathode. A paste of _______ is used as an electrolyte.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- In a mercury cell, the electrolyte used is typically a paste of potassium hydroxide (KOH) and mercury(II) oxide (HgO).
- The paste serves as a source of hydroxide ions (OH-) that are needed to complete the electrochemical reaction occurring in the cell.
- The reaction at the anode involves the oxidation of the zinc in the amalgam to form zinc ions (Zn2+) and electrons (e-).
While at the cathode, the reduction of the mercury(II) oxide and the production of liquid mercury takes place.
Overall, the reaction can be represented as:
Zn(Hg) + HgO(s) + 2 KOH(aq) → ZnO(s) + Hg(l) + 2 K[Hg] + H2O(l)
where [Hg] represents a complex of mercury and potassium.
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