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EMF

Calculate the...

Question

Calculate the standard EMF of the following cell $C d | C d^{2 +} | | A g^{+} | A g$

Given that $E_{C d^{2 +} | C d}^{o} = - 0.40 V, E_{A g^{o} | A g}^{o} = 0.8 V$ .

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Solution

Cell reaction:

$C d + 2 A g^{+} \to C d^{2 +} + 2 A g$ .

Now,

$E_{c e l l}^{0} = (E_{r e d}^{0})_{c} - (E_{r e d}^{0})_{a}$

$E_{c e l l}^{0} = 0.8 - (- 0.40)$

$E_{c e l l}^{0} = 1.20 V$

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