Chapter Chemical Equilibrium Chemistry Class 11 Tutorials ( in Urdu / Hindi)

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What is Chemical Equilibrium?

“A stage during a reversible reaction  at which rate of forward reaction becomes equal to the rate of reverse reaction  is called Chemical Equilibrium.”

e.g.  

H2(g)   +     I2(g)  ⇌     2HI(g)  

   is a reversible reaction

            At beginning only forward reaction occurs and no reverse reaction as no products are there. But then backward reaction also starts. With the passage of time rate of forward reaction becomes slow and slow as concentrations of reactants drop first rapidly and then slowly, while rate of reverse reaction becomes fast and fast as concentration of products increases first rapidly and then slowly, and ultimately two rates become equal. This stage of the reaction is called equilibrium.      

In above mentioned case, reaction started with formation of Hydrogen Iodide but with passage of time rate of formation of Hydrogen Iodide becomes slow and slow while rate of its dissociation becomes fast and fast and ultimately the two rates becomes equal and equilibrium establishes.   

At equilibrium:                                                                                                           

(i)         Rate of forward and reverse reaction becomes equal.

(ii)        Concentrations of reactants and products become constant i.e. no further change in concentration of reactants or products occurs.

(iii)       For equilibrium to exist, a close system is usually necessary so that neither reactants nor products escape.

  • Equilibriums are of two types
  • (i) Static equilibrium
  • (ii) Dynamic equilibrium.
  • Static equilibrium is the one in which system is stationary e.g. a book lying on table is in static equilibrium.
  • Dynamic equilibrium is the one in which system is moving with constant speed e.g. Earth is moving around Sun with constant speed so its equilibrium is dynamic equilibrium, similarly chemical equilibrium is also dynamic equilibrium.

Chemical Equilibrium Chemistry Tutorials ( in Urdu / Hindi)

Click the below links to Watch Free Chemistry video Lectures:

Reversible reaction and Irreversible reaction

What is Chemical Equilibrium?

Law of Mass Action

Equilibrium Constant and its unit

Importance of Equilibrium Constant Kc (Part 1) – Prediction of the direction of a reaction

Importance of Equilibrium Constant (Part 2) – Prediction of the Extent of a Reaction

EQUILIBRIUM CONSTANT Kp, Kc, Kx & Kn

Effect of the changing the Concentration of reactant or product- Le Chatelier Principle

Effect of the change in pressure on Equilibrium state-Le Chateliers Principle

How does temperature affect Le-Chatelier’s principle

Effect of Catalyst on Equilibrium Reaction | Le chatelier’s principle

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