Complete Theory

Worked Examples

Example 1Cell EMF with Nernst equation

Example 2Mass deposited by electrolysis

Exercise 1Standard cell potentialMedium

📋 Problem to solve

Calculate

E^\circ_{cell}

for

\mathrm{Mg(s) + 2Ag^+(aq) \to Mg^{2+}(aq) + 2Ag(s)}

E^\circ(\mathrm{Mg^{2+}/Mg}) = -2.37

E^\circ(\mathrm{Ag^+/Ag}) = +0.80

📌 Given data

E°(Mg²⁺/Mg) = −2.37 VE°(Ag⁺/Ag) = +0.80 V

Exercise 2Nernst equationMedium

📋 Problem to solve

For the cell

\mathrm{Zn|Zn^{2+}(x\,M)||Cu^{2+}(0.50\,M)|Cu}

E_{cell} = 1.12

V. Find

[\mathrm{Zn^{2+}}]

E^\circ_{cell} = 1.10

📌 Given data

E_{cell} = 1.12

E^\circ_{cell} = 1.10

[\mathrm{Cu^{2+}}] = 0.50

n = 2

T = 25°C

Exercise 3Electrolysis timeHard

📋 Problem to solve

How long must a current of 5.00 A be passed to deposit 10.0 g of silver from AgNO₃?

M(\mathrm{Ag}) = 107.87

g/mol.

📌 Given data

I = 5.00 Am = 10.0 gM = 107.87 g/molAg⁺ + e⁻ → Ag (n=1)F = 96485 C/mol

📚

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