Frequently Asked Questions
What does a large equilibrium constant mean?
A large equilibrium constant means products are strongly favored at equilibrium, while a small constant means reactants dominate.
Should I include solids and liquids in the expression?
No. Pure solids and pure liquids are normally left out of the equilibrium expression because their activities are taken as one.
Should I use initial or equilibrium concentrations?
Always use the equilibrium concentrations, not the initial amounts. The equilibrium constant only holds once the reaction has reached equilibrium, so plugging in starting concentrations gives the reaction quotient Q rather than K.
What is the difference between Kc, Kp, and Keq?
Keq is the general term for an equilibrium constant. Kc is the version written with molar concentrations in mol/L, which is what this calculator computes. Kp is written with the partial pressures of gaseous species instead. For a gas-phase reaction the two relate by Kp = Kc(RT)^Δn, where Δn is the change in moles of gas from reactants to products; when Δn = 0 the two are numerically equal. Use Kc for reactions in solution and Kp when the species are gases quoted by pressure.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.