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ChemistryElectrochemistryGalvanic cells/Nernst Equation/Concentration CellsHard2 minPYQ_2019

ChemistryHardsingle choice

Calculate E.M.F. of following cell art 298 K Zn(S) $|Z n S O_{4} (0.01 M)| |C u S O_{4} (1.0 M)| C u (s)$ if
$E^{o} c e l l = 2.0 V$

Options:

Answer:

Solution:

Key IdeaGeneral from of Nernst equation is
$E_{(M^{n +} / M)} = E_{(m^{n +} / M)}^{o} - \frac{R T}{n F} I n \frac{[M]}{[M^{n +}]}$
Oxidation $Z n (s) \to Z n^{+} (a q) [0.01 M] + 2 e^{-}$
Reduction $C u^{2 +} (a q) [1.0] M \to C u (s)$
Using Nernst equation,
$E_{c e l l} = E_{c e l l}^{o} - \frac{0.059}{2} l o g [\frac{1}{100}]$
$= 2 - \frac{0.59}{2} \times - 2 = 2 + 0.059$
$= 2.059 V$

Stream:MHT_CETSubject:ChemistryTopic:ElectrochemistrySubtopic:Galvanic cells/Nernst Equation/Concentration Cells

⏱ 2mℹ️ Source: PYQ_2019

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