Q value

Definition

The Q value is a measure of the relative amounts of reactants and products at a given time during a chemical reaction. It is calculated by substituting the concentrations or partial pressures of reactants and products into the equilibrium expression.

Related terms

Equilibrium constant (K): The equilibrium constant is an expression used to describe the extent to which reactants are converted into products at equilibrium. It is calculated by dividing the concentrations or partial pressures of products by those of reactants.

Le Chatelier's Principle: Le Chatelier's Principle states that when a system in equilibrium is subjected to stress (change in temperature, pressure, or concentration), it will shift in such a way as to minimize that stress and restore equilibrium.

Reaction quotient (Qc/Qp): The reaction quotient, similar to the equilibrium constant K, provides information about the relative amounts of reactants and products. However, unlike K which describes an equilibrium state, Q can be calculated at any point during a reaction using initial conditions.