Equilibrium Constant Calculator
Calculate Kc from product and reactant concentrations with stoichiometric coefficients.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Request a ToolHow to Use the Equilibrium Constant Calculator
Enter the equilibrium concentration of a product and its coefficient (exponent), plus the equilibrium concentration of a reactant and its coefficient. The calculator computes Kc = [products]^coefficients / [reactants]^coefficients.
About the Equilibrium Constant Calculator
The equilibrium constant Kc quantifies the position of a chemical equilibrium. It is the ratio of product concentrations to reactant concentrations, each raised to the power of their stoichiometric coefficients. A large Kc means the reaction strongly favors products at equilibrium.
Frequently Asked Questions
What does Kc tell you about a reaction?
Kc indicates the position of equilibrium. If Kc >> 1, products are favored. If Kc << 1, reactants are favored. Kc = 1 means roughly equal concentrations of products and reactants at equilibrium.
Does Kc change with temperature?
Yes. Kc depends on temperature. For exothermic reactions, Kc decreases as temperature increases. For endothermic reactions, Kc increases with temperature. This follows from the van't Hoff equation.
What is the difference between Kc and Kp?
Kc uses molar concentrations, Kp uses partial pressures. They are related by Kp = Kc(RT)^(delta n), where delta n is the change in moles of gas from reactants to products.