Chapter 07 – Equilibrium

Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Law of Mass Action
Law of Chemical Equilibrium
Equilibrium Constant in terms of Concentration (Kc)
Equilibrium Constant in terms of Pressure (Kp)
Characteristics of Equilibrium Constants
Effect of Temperature and Catalyst on Equilibrium Constant
Units of Equilibrium Constant

This video is about characteristics of equilibrium and Equilibrium constant. lt also explains law of mass action an law of chemical equilibrium. Various examples related to writing the equilibrium constant have also been discussed. It also explains the equilibrium constant in terms of concentration and pressure.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

In view of the congested classrooms coupled with hefty tuition fee, social taboos and hazards of travelling (for girls in particular) this mode of extending education had become a necessity.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Relationship between Equilibrium Constant in Terms of concentration (Kc)
Relationship between Equilibrium Constant in terms of Pressure (Kp)
Derivation of Relationship Kp=Kc (RT)
Some Numerical Examples related to characteristics of Equilibrium Constants, and Relationship between Kp and Kc

In this video relationship between Kp and Kc has been derived. Some examples related to this relationship on the basis of characteristics of equilibrium constant have also been discussed.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

In view of the congested classrooms coupled with hefty tuition fee, social taboos and hazards of travelling (for girls in particular) this mode of extending education had become a necessity.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Types of Chemical Equilibrium
Homogeneous and Heterogeneous Equilibria
Equilibrium Constant for two Types of Equilibria
Degree of Dissociation and Equilibrium Constant

This video explains the types of equilibria like homogeneous and heterogeneous equilibrium and writing the expression of equilibrium constant for these. Degree of dissociation has also been discussed here and the expressions for equilibrium constant have been derived in terms of it.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Applications of Equilibrium Constant
Predicting the Extent of Reaction
Predicting the Direction of Equilibrium
Reaction or Concentration Quotient
Calculation of Equilibrium Concentration
Sample Problems to the Applications Discussed

It explains the application of equilibrium constant-Prediction of extent of reaction, direction of reaction and calculation of equilibrium concentration of each species. Some numerical problems related to these applications have also been discussed.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

In view of the congested classrooms coupled with hefty tuition fee, social taboos and hazards of travelling (for girls in particular) this mode of extending education had become a necessity.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Factors Affecting Equilibrium Part-1
Effect of Catalyst
Addition of inert gas at Constant Pressure and Constant Volume

This video deals with the factors affecting equilibrium. In this video the two factors - presence of catalyst and presence of inert gas under constant volume and pressure have been discussed. Some examples are also discussed to make understanding clear.


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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Factors Affecting Equilibrium Part-2
Effect of Temperature, Pressure and Concentration of Reactant and Product - Le-Chatelier's Principle
Examples Illustrating Applications of Le-Chatelier's Principle

This lecture is about the factors affecting equilibrium - Le Chatelier's Principle. It explains the effect of change in concentration, temperature and pressure on equilirium. Applications of the principle have also been discussed like how to decide the suitable conditions for maximum product yield in a chemical reaction.


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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Ionic Equilibrium
Electrolyte and Non-Electrolyte
Degree of Dissociation
Strong and Weak Electrolyte
Dissociation and Ionization
Ionic Equation and Ionization Constants
Ostwald's Dilution Law for Ionization of weak Electrolytes

This is an introductory video about Ionic Equilibrium which explains the terms like electrolyte, non-electrolyte, strong and weak electrolyte, degree of dissociation, ionisation and ionisation constant. lt also explains the Ostwald's dilution law for weak electrolyte.


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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Concepts of Acids and Bases Part-1
Sample Problem based on Ostwald's dilution Law
Classical Concept of Acids and Bases
Arrhenius Concept
Limitations of Arrhenius Concept: No explanation for hydration of H+ and OH- ions, Not Applicable to non-aqueous medium

In this video initially an example related to Ostwald's dilution law has been discussed. Later, it explains various concepts of acid and base. In this lecture Classical concept and Arrhenius concept of acids and bases have been explained. Also the limitations of each concept have been discussed.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Concepts of Acids and Bases Part-2
Bronsted-Lowry Theory of Acids and Bases
Conjugate Acid Base Pairs
Relative Strength of Conjugate Acids and Bases
Amphiprotic Substances
Advantages and Limitations of Bronsted-Lowry Theory
Lewis Concept of Acids and Basis: Advantages and Limitations
Types of Lewis's Acids and basis

This video explains the acids and bases on the basis of Bronsted- Lowry theory and Lewis Theory. lt also explains conjugate acid base pairs and their relative strengths on the basis of Bronsted Lowry theory. Also explains the amphiprotic or amphoteric substances. The advantages and limitations of both the theories have also been discussed.


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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Relative Strengths of Acids and Bases
Comparison of Arrhenius Acids and Bases
Comparison of Bronsted-Lowry Acids and Bases
Acidic Strength of Hydroacids across the period and down the group

This video explains the relative strengths of acids and bases in terms of Arrhenius concept and Bronsted-Lowry theory, Comparison of acid base strength in terms of degree of dissociation and dissociation constants. The effect of polarity factor and size factor for comparing àcidic strength of hydroacids has also been discussed


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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Ionic Product of Water
Ionization Constant and Ionic Product of Water (Kw)
Effect of Temperature on Kw
Acidic, Basis and Neutral Solution in terms of H+ and OH- ion Concentration

This video is about Ionisation constant and Ionic product of water. Effect of temperature on Ionic product of water has also been discussed. It also explains the acidic, basic and neutral solutions on the basis of relative concentrations of hydrogen and hydroxide ions.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
pH Value and pH Scale
Definition and Numerical Expression for pH value
pOH and its relationship with pH
Relationship Between Dissociation Constant of Acids and Bases and Ionic Product of Water
pH of Neutral Water and Ionic Product of Water
pH of Neutral Water and Effect of Temperature on pH of Neutral Water
Limitations of pH scale

This lecture is about pH and pH scale. Cocept of pOH has also been explained. A relationship between pKa, pKb and pKw has been derived. In this lecture effect of temperature on pH of neutral water has also been discussed.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Numerical Examples Related to pH of Solution
Some Fundamentals of solving Log values

In this lecture some numerical problems related to pH calculation has been explained. It also deals with some basic information about solving log values so that students don't face any problem while solving numerical problems related to pH.

This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Sample Problems for Calculating pH of various Solutions
pH of NaOH and HCl
pH of Mixtures of Acid and Base Solution

This video explains some more examples related to calculation of pH of various solutions like 10-8 M NaOH and 10-8 M HCl solution and pH of mixture of acid and base.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Salt Hydrolysis
Salts of Strong Acid and Strong Base
Salt of Weak Acid and Strong Base
No Hydrolysis and Anionic Hydrolysis
Hydrolysis Constant
Degree of Hydrolysis and pH of the Salt Solution
Salts of Strong Acid and Weak Base, Weak Acid and Strong Base
Cationic Hydrolysis and Complete Hydrolysis


Hydrolysis of various salts like salt of weak acid and weak base, strong acid and strong base, weak acid and strong base, strong acid and weak base has been discussed. Expressions for calculation of hydrolysis constant, degree of hydrolysis and pH are also explained.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Solubility and Solubility Product (Ksp)
Expression for Solubility Product of a Sparingly Soluble Salt
Difference between Ionic Product and Solubility Product
Application of a Solubility Product
Calculation of Solubility of Sparingly Soluble Salt
Prediction of Precipitation Reaction
Solubility of a Sparingly Soluble Salt in Presence of a Common Ion
Preparation of Common Salt
Salting out of Soap

This video is about Solubility and Solubility product of a sparingly soluble salt. Solubility product expressions for various electrolytes have been discussed. This video lecture also explains the application of solubility product like calculating the solubility of sparingly soluble salt, prediction of precipitation reaction, preparation of common salt from sea water and salting out of soap.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Common Ion Effect
Decrease in Degree of Dissociation of Weak Electrolyte
Application of Common Ion Effect: In Qualitative Analysis, Precipitation of Sulphides of Group II and IV, Buffer Action of Buffer Solution and Precipitation of Hydroxides of Group-III

This lecture is about Common Ion Effect and its application in qualitative analysis of salt like precipitation of sulphides of group 2 and 4, precipitation of hydroxides of group 5.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Dr. D. R. Vij
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Class XI - Chemistry
Unit 7 - Chemical Equilibrium
Buffer Solutions
Types of Buffer Solutions
Solutions of Single Substance
Acidic and Basic Buffer
Buffer Action of Acidic and Basic Buffers
pH of Acidic and Basic Buffer
Henderson-Hasselbalch Equation
Buffer Capacity
Importance of Buffer

This lecture is about buffer solution, types of buffer solution, mechanism of buffer action, buffer capacity, pH of buffer solution (Henderson -Hesselbalch equation) and application of buffer solution.


This Channel initiated by Dr. D. R. Vij (former Professor of Physics, Kurukshetra University, India) primarily aims at taking free education to the doorsteps of learners who for various economic and social factors can not avail benefits of regular coaching.

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Dr. D. R. Vij
Professor of Physics (Retd.)
(Mob) +919416220316