The standard cell potential for $Z n | Z n^{2 +} | | C u^{2 +} | C u$ is 1.10V. When the cell is completely discharged, $l o g [Z n^{2 +}] / [C u^{2 +}]$ is closest to:

37.3

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0.026

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18.7

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0.052

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Solution

The correct option is A 37.3
$Z n | Z n^{2 +} | | C u^{2 +} | C u$ ;
$0 = E_{c e l l}^{0} - \frac{0.0591}{2} l o g \frac{[Z n^{2 +}]}{[C u^{2 +}]}$

$l o g \frac{[Z n^{2 +}]}{[C u^{2 +}]} = \frac{2.2}{0.0591} = 37.3$
$E_{c e l l}^{0} = 1.1 V$

$- 1.1 = - \frac{0.0591}{2} l o g_{10} \frac{[Z n^{2 +}]}{[C u^{2 +}]}$

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The standard cell potential for $Z n | Z n^{2 +} | | C u^{2 +} | C u i s 1.10 V .$ When the cell is completely discharged, $l o g \frac{[Z n^{2 +}]}{[C u^{2 +}]}$ is closest to

Q. The cell,

Z n (s) | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u (s) (E_{c e l l}^{\circ} = + 1.10 V)

was allowed to be completely discharged at

298 K

. The relative concentration of

Z n^{2 +}

C u^{2 +} (\frac{[Z n^{2 +}]}{[C u^{2 +}]})

is________.

The cell, $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) |$ $C u (E_{c e l l}^{0} = 1.10 V)$ , was allowed to be completely discharged at 298 K. The relative concentration of $Z n^{2 +}$ to $C u^{2 +} (\frac{[Z n^{2 +}]}{[C u^{2 +}]})$ is :