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Electrochemical Cells, Galvanic Cells

Daniel cell c...

Question

Daniel cell can be represented in which of the following way?

Z n_{(s)} | Z n_{(a q)}^{2 +} | | C u_{(s)} | C u_{(a q)}^{2 +}

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Z n_{(s)} | Z n_{(a q)}^{2 +} | | C u_{(a q)}^{2 +} | C u_{(s)}

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C u_{(s)} | C u_{(a q)}^{2 +} | | Z n_{(a q)}^{2 +} | Z n_{(s)}

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Z n_{(a q)}^{2 +} | Z n_{(s)} | | C u_{(a q)}^{2 +} | C u_{(s)}

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Solution

The correct option is B $Z n_{(s)} | Z n_{(a q)}^{2 +} | | C u_{(a q)}^{2 +} | C u_{(s)}$
In daniel cell, zinc gets oxidized (as anode) and Cu gets reduced(cathode).
$∴$ Correct cell representation: $Z n (s) | Z n^{2 +} (a q) | | C u^{2 +} (a q) | C u (s)$ .
Hence, correct option is B.

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Similar questions

(E^{\circ})

+ 1.1 V

Δ G^{\circ}

Z n (s) + C u_{(a q)}^{2 +} \to Z n_{(a q)}^{2 +} + C u (s)

(1 F = 96500 C / m o l)

The EMF of the Daniell cell is 1.1V . The external EMF to be applied for the following reaction to take place in it is:

$C u (s) + Z n {(a q)}^{2 +} \to C u {(a q)}^{2 +} + Z n (s)$

Z n_{(s)} + {C u_{(a q)}}^{2 +} \to C u_{(s)} + {Z n_{(a q)}}^{2 +}

^{o}

^{2 +}

^{2 +}

C u_{(s)} \to C u_{(a q)}^{2 +} + 2 e^{-}; E^{o} = - 0.325 V

C u_{(a q)}^{+} + e^{-} \to C u_{(s)}; E^{o} = 0.50 V

E^{o}

2 C u_{(a q)}^{+} \to C u_{(a q)}^{2 +} + C u_{(s)}

25^{\circ} C

C u_{(a q)}^{2 +} + 2 e^{-} \to C u_{(s)} E^{\circ} = 0.337 V

Z n_{(a q)}^{2 +} + 2 e^{-} \to Z n_{(s)} E^{\circ} = - 0.763 V

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