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Formula Sheet

Electrochemistry — Formula Sheet

Punjab Board · Class 12 · Chemistry

6 formulas from Electrochemistry (Punjab Board Class 12 Chemistry) on one page, grouped by topic. Part of the Punjab Board Class 12 Chemistry syllabus.

45 questions36 flashcards6 formulas & key relations5 concepts

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6 Entries · 4 Sections

Formulas and Key Relations

Nernst Equation

General Nernst equation for a cell

E_cell = E°_cell – (RT/nF) ln Q

Conductance of Electrolytic Solutions

Resistance (R) of a conductor

R = ρl/A (in ohms, Ω); where ρ = resistivity, l = length, A = cross-section area.

Conductance (G) = 1/R = κA/l. SI unit: Siemens (S) or Ω⁻¹.

Variation of Molar Conductivity and Kohlrausch's Law

STRONG ELECTROLYTES (e.g., NaCl, KCl, HCl)

Λm increases SLOWLY with dilution. Debye-Hückel-Onsager equation: Λm = Λ°m – A√c (Debye-Hückel-Onsager or Kohlrausch equation).

Plot of Λm vs √c is a straight line for strong electrolytes. Intercept = Λ°m, Slope = –A.

Key relations

The Nernst equation relates electrode potential to concentration: E = E° - (RT/nF)ln(Q) or E = E° - (0.059/n)log(Q) at 298K.

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Frequently Asked Questions

What are the important topics in Electrochemistry for Punjab Board Class 12 Chemistry?
Key topics in Electrochemistry include Electrochemical Cells – Galvanic and Electrolytic, Nernst Equation, Conductance of Electrolytic Solutions, Variation of Molar Conductivity and Kohlrausch's Law. Study these first, then practise questions on each for the Punjab Board Class 12 board exam.
How many formulas are in Electrochemistry?
This sheet lists 6 formulas from Electrochemistry, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Electrochemistry for the Punjab Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Electrochemistry. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Electrochemistry

All Punjab Board Class 12 Chemistry Formula Sheet

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