Ionic Equilibrium Lecture 4 | Ostwald’s Dilution Law, Degree of Ionization & Ionic Product of Water

Ionic Equilibrium Lecture 4 | Ostwald’s Dilution Law, Degree of Ionization & Ionic Product of Water | Repeater Batch | ChembyKKSir #IonicEquilibrium #IonicEquilibriumLecture4 #OstwaldDilutionLaw #WeakElectrolyte #WeakAcid #WeakBase #DegreeOfIonization #DilutionEffect #IonizationOfWater #IonicProductOfWater #Kw #PhysicalChemistry #NCERTChemistry #NEETChemistry #JEEChemistry #RepeaterBatch #NEET2025 #JEE2025 #ChemistryByKKSir #ChembyKKSir 🌍 Namaste Dear Students! 🙏 Welcome to Ionic Equilibrium – Lecture 4, where we begin the first major numerical and law-based portion of the chapter — Ostwald’s Dilution Law, one of the most important topics for NEET and JEE. This lecture builds directly on the acid–base concepts, salt classification and equilibrium ideas discussed in Lectures 1, 2 and 3, and converts theory into clear mathematical and logical understanding. In this session, I — Krishna Kumar Sah (ChembyKKSir) — derive and explain how degree of ionization of weak electrolytes depends on concentration, and why dilution increases ionization. ⸻ 🧪 Topics Covered — Ionic Equilibrium Lecture 4 1️⃣ Ostwald’s Dilution Law (Core Focus) • Statement of Ostwald’s dilution law • Applicability to weak electrolytes only • Limitations of the law 2️⃣ Weak Electrolytes • Weak acids • Weak bases • Establishment of ionic equilibrium • Why strong electrolytes do not follow Ostwald’s law 3️⃣ Degree of Ionization (α) • Mathematical derivation of degree of dissociation • α ∝ 1 / √C (inverse proportionality with square root of concentration) • Effect of dilution on ionization • Physical meaning of increasing α on dilution 4️⃣ Effect of Dilution • Why dilution shifts equilibrium forward • Relation with Le Chatelier’s Principle • Conceptual and numerical clarity 5️⃣ Ionization of Water • Self-ionization of water • Degree of ionization of pure water • Weak electrolyte nature of water 6️⃣ Ionic Product of Water (Kᵥ / Kw) • Definition and significance of Kw • Ionic product of pure water • Temperature dependence (conceptual) • Role of Kw in pH calculations ⸻ 📚 Ionic Equilibrium — Chapter Flow (So Far) ✔ Electrolytes and Non-Electrolytes ✔ Acids, Bases and Salts ✔ Arrhenius, Brønsted–Lowry and Lewis Concepts ✔ Classification of Salts ✔ Ostwald’s Dilution Law ✔ Degree of Ionization ✔ Ionization of Water ✔ Ionic Product of Water (Kw) (Upcoming: pH, buffers, hydrolysis, Kₐ, K_b, Ksp, common ion effect & numericals) ⸻ 🎯 Why This Lecture Is Extremely Important This lecture is the foundation for almost all numericals of Ionic Equilibrium: ✔ pH of weak acids and bases ✔ Ka–Kb relationships ✔ Buffer solutions ✔ Hydrolysis of salts If Ostwald’s law is clear, half of Ionic Equilibrium is already mastered. ⸻ 👩‍🎓👨‍🎓 Best For • Repeater Batch Students • NEET UG Aspirants • JEE Main & JEE Advanced Aspirants • Class 11 & 12 Students • MHT-CET, WBJEE, KCET, VITEEE Aspirants ⸻ 👨‍🏫 Educator — ChembyKKSir Krishna Kumar Sah Senior Chemistry Faculty Medical Head — EURO JEE-NEET, PCMC Pune 🧪 15+ Years of Teaching Experience 🎯 Mentor of NEET AIR 75 & JEE Advanced AIR 48 ⸻ 🌐 Connect With Me 📸 Instagram:   / chembykksir   📢 WhatsApp Channel: https://whatsapp.com/channel/0029Vb6F... 📘 Facebook: https://www.facebook.com/share/1ACSwY... 📲 Telegram: https://t.me/chembykksir 💼 LinkedIn:   / krishna-kumar-sah-13708661   ▶️ YouTube:    / @chembykksir