What are galvanic cells in terms of oxidation/reduction reactions?

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What are galvanic cells in terms of oxidation/reduction reactions?

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Answer 1 · 2018-04-11T16:21:53

Galvanic cell is a cell consists of 3 parts:
1) Reduction half cell
2) Oxidation half cell
3) Salt Bridge.
Consider a reaction,
$Z n + 2 A g^{+} \to Z n^{2 +} + 2 A g$ $Zn+2Ag^+ rarr Zn^(2+)+2Ag$
so it is represented as,
$Z n$ $Zn$ / $Z n^{2 +}$ $Zn^(2+)$ $|\ |$ $2Ag^+$ / $2Ag$
where, the parallel line shows the salt bridge.
Anode =) $Zn rarr Zn^(2+) +2e^-$
Cathode =) $(2Ag^+ +e^-) rarr 2Ag)*2$ (bcoz we have to cancel the $e^-$ s so multiply (2) equation by 2)
Now, the required galvanic cell eqn is,
$Zn+2Ag^+ rarr Zn^(2+)+2Ag$

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What are galvanic cells in terms of oxidation/reduction reactions?

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