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Chemical Equilibrium

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Chemical Equilibrium

Effect of a Catalyst on Equilibrium

A catalyst changes how quickly equilibrium is reached but never where that equilibrium lies.

K unchanged Dimensionless
Chemical Equilibrium

Effect of an Inert Gas

The influence of adding a non-reacting gas on the position of a gaseous equilibrium.

Pa
Chemical Equilibrium

Effect of Concentration Change

The shift in equilibrium position caused by adding or removing a reactant or product.

Q ≠ K → shift until Q = K mol/L
Chemical Equilibrium

Effect of Pressure Change

The shift in a gaseous equilibrium caused by changing the total pressure through a volume change.

shift towards fewer gas moles when p rises Pa
Chemical Equilibrium

Effect of Temperature Change

The shift in equilibrium caused by heating or cooling, which uniquely also changes the equilibrium constant.

exothermic: K falls as T rises K
Chemical Equilibrium

Equilibrium Constant

The fixed ratio of product to reactant terms, each raised to its stoichiometric power, that characterises a reaction at a given temperature.

K = Π[products]^ν / Π[reactants]^ν Various
Chemical Equilibrium

Equilibrium Constant of a Reversed Reaction

The constant obtained when a reaction is written in the opposite direction, equal to the reciprocal of the original.

K_reverse = 1 / K_forward Various
Chemical Equilibrium

Equilibrium Constant of a Scaled Reaction

The constant obtained when every coefficient in an equation is multiplied by the same factor.

K_new = K_old^n Various
Chemical Equilibrium

Equilibrium in Closed Systems

The requirement that no matter enters or leaves for a true chemical equilibrium to be established.

Dimensionless
Chemical Equilibrium

Equilibrium Position

The particular set of concentrations at which a system settles, describing how far the reaction has proceeded.

mol/L
Chemical Equilibrium

Equilibrium Yield

The proportion of reactant converted to product once equilibrium has been reached.

yield = n_product / n_theoretical Dimensionless
Chemical Equilibrium

Extent of Reaction

A single variable measuring how far a reaction has progressed from pure reactants towards products.

ξ = (n_i − n_i°) / ν_i mol