Depict the galvanic cell in which the reaction Zn

Question:

Depict the galvanic cell in which the reaction $\mathrm{Zn}(\mathrm{s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s})$ takes place, further show:

(i) which of the electrode is negatively charged,

(ii) the carriers of the current in the cell, and

(iii) individual reaction at each electrode.

Solution:

The galvanic cell corresponding to the given redox reaction can be represented as:

$\mathrm{Zn}\left|\mathrm{Zn}_{\left(a_{q}\right)}^{2+}\right|\left|\mathrm{Ag}_{\left(a_{q}\right)}^{+}\right| \mathrm{Ag}$

(i) $\mathrm{Zn}$ electrode is negatively charged because at this electrode, $\mathrm{Zn}$ oxidizes to $\mathrm{Zn}^{2+}$ and the leaving electrons accumulate on this electrode.

(ii) Ions are the carriers of current in the cell.

(iii) The reaction taking place at Zn electrode can be represented as:

$\mathrm{Zn}_{(s)} \longrightarrow \mathrm{Zn}_{(a q)}^{2+}+2 \mathrm{e}^{-}$

And the reaction taking place at Ag electrode can be represented as:

$\mathrm{Ag}_{(\text {aq })}^{+}+\mathrm{e}^{-} \longrightarrow \mathrm{Ag}_{(s)}$

 

 

 

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