The Law of Mass Action

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

The law of mass action is one example of Le Chatelier's principle, that the equilibrium in a chemical system responds to a change in concentration, temperature, or pressure by shifting in the direction which partially counteracts the imposed perturbation. Thus if the reaction considered were exothermic, such that heat could formally be regarded as one of the products, an increase in temperature would shift the equilibrium to the left. If A, B and C were gases, an increase in total pressure would shift the equilibrium to the right.

Contributed by: S. M. Blinder (March 2011)
Open content licensed under CC BY-NC-SA



Snapshot 1: when is large, the reactants and are almost completely converted into product

Snapshot 2: conversely, for small , pure will almost entirely convert to and

Snapshot 3: adding more to the reaction mixture will shift the equilibrium toward higher concentrations of and

Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.