Chemistry Assignment Help with Factors Affecting Equilibrium Constant
5.5 Factors Affecting Equilibrium Constant
Representation of Equilibrium ReactionThough equilibrium can be attained from either side, the way equilibrium is represented is important for equilibrium constant calculation.
Example : - For
Hence it is important how equilibrium is represented in equation.
Stoichiometry of Equilibrium Reaction
Though two equilibrium reaction are same representing change in same direction. Two equilibrium constants are not same. In fact
Thus stoichiometry equation is important
Equilibrium constant value changes by the way activity of reactant/ products is represented. Equilibrium constant of concentration is not equal to equilibrium constant of pressure if numbers of moles are changing in reversible reaction.
In a reversible reaction; concentration of Reactants and products keep on changing, till equilibrium is established. At any point of time the ratio of activity of Reactant(s)/ Product(s)
where Q is Reaction Quotient
The value of reaction quotient helps to predict state of reversible reaction.
If Q > Kc then the rate of backward reaction is faster then forward reaction
If Q = Kc then the reaction is in equilibrium i.e., rate of forward reaction is equal to rate of backward reaction.
If Q < Kc then, the rate of forward reaction is greater then backward reaction.
Relation between Kc & Kp
For the process considering concentration terms only, equilibrium constant
If we consider partial presence of all species then by gas equation
or P = CRT
Thus PA = CART
PB = CBRT
PM = CMRT
Where = difference in no of moles of gaseous species only.
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