Depict the galvanic cell in which the reaction $$\mathrm{Zn(s)+2Ag^+(aq)\longrightarrow Zn^{2+}(aq)+2Ag(s)}$$ takes place. Which of its electrodes is negatively charged?

CBSE Class 12 · 2008 · Foreign · Redox Reactions and ElectrochemistryShort Answer

Depict the galvanic cell in which the reaction

Zn (s) + 2A g^{+} (aq) ⟶ Z n^{2 +} (aq) + 2Ag (s)

takes place. Which of its electrodes is negatively charged?

Answer: Zn(s)|Zn²⁺(aq)||Ag⁺(aq)|Ag(s); the zinc electrode (anode) is negatively charged.

Solution

Cell representation:

Zn (s) ∣ Z n^{2 +} (aq) ∣∣ A g^{+} (aq) ∣ Ag (s)

Zinc is oxidised, so the zinc electrode is the anode, and in a galvanic cell the anode carries the negative charge (electrons accumulate there and leave through the external circuit).

CBSE Class 12 Board · 2008 · Foreign · Subjective

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