Chapter 23 of 46
Revision Notes
Ionic Equilibrium — Revision Notes
JEE Advanced · Chemistry
Free Ionic Equilibrium revision notes for JEE Advanced Chemistry 2026 — key concepts, formulas, and definitions for quick revision.
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Key concepts, formulas, and definitions from Ionic Equilibrium for JEE Advanced Chemistry preparation.
Key Topics to Revise
1
Strong and Weak Electrolytes
- Strong electrolytes dissociate almost completely (α ≈ 1) in aqueous solution (e.g., HCl, NaOH, NaCl)
- Weak electrolytes dissociate partially (α << 1) in aqueous solution (e.g., CH₃COOH, NH₄OH)
- Degree of dissociation (α) = Number of molecules dissociated / Total number of molecules
2
Ostwald's Dilution Law
- Applies only to weak electrolytes, relates degree of dissociation to concentration
- For weak electrolyte AB ⇌ A⁺ + B⁻: K = Cα²/(1-α)
- For very weak electrolytes (α << 1): K = Cα² or α = √(K/C)
3
Acid-Base Concepts
- Arrhenius concept: Acids give H⁺ ions, bases give OH⁻ ions (limited to aqueous solutions)
- Brønsted-Lowry concept: Acids are proton donors, bases are proton acceptors
- Lewis concept: Acids are electron pair acceptors, bases are electron pair donors
4
pH and pOH Scale
- pH = -log[H⁺], pOH = -log[OH⁻]
- At 25°C: pH + pOH = 14 (pKw = 14)
- Neutral solution: pH = pOH = 7 (at 25°C)
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Key Concepts
The fraction of total moleculesFor weak electrolytesArrheniusKw = [H⁺][OH⁻] = 1pH =
Frequently Asked Questions
What topics are covered in Ionic Equilibrium for JEE Advanced?
Ionic Equilibrium is an important chapter in JEE Advanced Chemistry. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Strong and Weak Electrolytes, Ostwald's Dilution Law, Acid-Base Concepts, pH and pOH Scale.
How important is Ionic Equilibrium for JEE Advanced?
Ionic Equilibrium is a frequently tested chapter in JEE Advanced Chemistry. Questions from this chapter appear regularly in previous year papers. There are 76 practice questions available for this chapter.
How to prepare Ionic Equilibrium for JEE Advanced?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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