Reaction Quotient Definition (Chemistry)

What Is a Reaction Quotient?

The reaction quotient is the ratio of the concentration of products to concentration of reactants.
The reaction quotient is the ratio of the concentration of products to concentration of reactants. PhotoAlto/Frederic Cirou / Getty Images

Reaction Quotient Definition: Reaction quotient is the ratio of the concentrations of the products of a reaction to the concentrations of the reactants.

Each concentration is raised to the power of the stoichiometric coefficient in the chemical formula.

In general, for the reaction:

aA + bB → cC + dD

The reaction quotient, Q is

Q = [C]c[D]d/[A]a[B]b

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Helmenstine, Anne Marie, Ph.D. "Reaction Quotient Definition (Chemistry)." ThoughtCo, Jul. 24, 2017, thoughtco.com/definition-of-reaction-quotient-605596. Helmenstine, Anne Marie, Ph.D. (2017, July 24). Reaction Quotient Definition (Chemistry). Retrieved from https://www.thoughtco.com/definition-of-reaction-quotient-605596 Helmenstine, Anne Marie, Ph.D. "Reaction Quotient Definition (Chemistry)." ThoughtCo. https://www.thoughtco.com/definition-of-reaction-quotient-605596 (accessed January 22, 2018).