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NEET Chemistry Notes Chemical Equilibrium – Equilibrium State

NEET Chemistry Notes Chemical Equilibrium – Equilibrium State

Equilibrium State

Equilibrium State

In a reversible reaction, the point at which there is no further change in concentration of reactants and products, is called equilibrium state.
Dynamic Nature Equilibrium is always dynamic in nature i.e. the reaction does not stop but goes on forward and backward directions with equal speed
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 1
It indicates that at equilibrium, rate of conversion of ice into water = rate of conversion of water into ice
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 2

Equilibrium in Physical and Chemical Processes Equilibrium in Physical Processes

The equilibrium developing between different phases or physical properties of a substance is termed as physical equilibria.
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 3
Equilibrium in Chemical Processes

In case of reversible reactions, when the concentration of reactants and products do not change with time, the reaction is called in a state of chemical equilibrium.
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 4

Law of Chemical Equilibrium

Law of mass action states, “Rate of a reaction is directly proportional to the concentration of reactants with each concentration term raised to the power equal to the respective stoichiometric coefficient”.
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 5
where, Kp= equilibrium constant in terms of partial pressure

Significance of  Kc and  Kp

  •  If Kc >103, products predominate over reactants. In other words, if Kc is very large, the reaction proceeds almost in all the ways to completion.
  • If Kc <10-3, reactants predominate over products. In other words, if Kc is very small, the reaction proceeds hardly at all.
  •  If Kc is in the range (10-3 to 103) appreciable concentration of both reactants and products are present.

Relation between  Kp and  Kc
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 6
R = gas constant, T = temperature in kelvin
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 7= gaseous moles of products – gaseous moles of reactants
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 8

Some Facts Related to Equilibrium Constant

  •  Equilibrium constant (Kc or Kp) does not depend on pressure, volume, concentration and catalyst but depends only upon temperature.
  •  Equilibrium constant for a given reaction is independent of the reaction mechanism.
  •  Equilibrium constant depends on stoichiometric coefficient e.g.
    NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 9

Units of Kc and  Kp

NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 10
Relation between K and NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 11

Gibbs free energy change and reaction quotient are related as
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 12
NEET Chemistry Notes Chemical Equilibrium - Equilibrium State 13

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