2.3.5 the reaction quotient, Q

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Reactivity 2.3.5 - the reaction quotient, , is calculated using the equilibrium expression with non-equilibrium concentrations of reactants and products

the reaction quotient, , is calculated using the same equation as the equilibrium constant expression, but with non-equilibrium concentrations of reactants and products

it is a useful concept as the size of can indicate how far a reaction is from equilibrium and in which direction the reaction proceeds

if:

• , then the reaction is at equilibrium, no net reaction occurs
• , the reaction proceeds to the right in favour of the products
• , the reaction proceeds to the left in favour of the reactants