Equilibrium Constant (Kc) Calculator
Calculate the equilibrium constant Kc for a reversible reaction from the equilibrium concentrations and stoichiometric coefficients of its products and reactants.
Ratio of product terms to reactant terms
- 1
Products term (numerator)
0,5^2 × 0,5 = 0,125 - 2
Reactants term (denominator)
0,2 × 0,1^3 = 0,0002 - 3
Equilibrium constant Kc
0,125 ÷ 0,0002 = 625Kc > 1 favors products; Kc < 1 favors reactants.
Miten tämä laskin toimii?
The equilibrium constant Kc equals the product of each product concentration raised to its coefficient, divided by the same product for the reactants. Enter equilibrium concentrations and coefficients for both sides; the calculator multiplies each side and divides products by reactants. Kc above 1 favors products, below 1 favors reactants.
Kaava
How this is calculated
The law of mass action states that for a reaction aA + bB ⇌ cC + dD at equilibrium, the equilibrium constant Kc equals the product of the product concentrations each raised to its stoichiometric coefficient, divided by the same product for the reactants: Kc = ([C]^c · [D]^d) / ([A]^a · [B]^b). Enter the product concentrations and their matching coefficients as two comma-separated lists, then do the same for the reactants. Each list of concentrations must have the same length as its list of coefficients.
For each side the calculator multiplies every concentration raised to its coefficient to form the numerator (products term) and denominator (reactants term), then divides them to get Kc. Concentrations are taken in mol/L, so Kc is unitless in this convention. Pure solids and liquids do not appear in the expression and should simply be omitted from the lists. A coefficient of 0 contributes a factor of 1, and a fractional coefficient is allowed.
Kc greater than 1 indicates the equilibrium lies toward the products, while Kc less than 1 means reactants are favored. The result is undefined if the reactants term is zero (division by zero) or if any concentration is negative; in those cases the calculator asks for valid input. The same arithmetic computes the reaction quotient Q when the concentrations are non-equilibrium values.
Usein kysytyt kysymykset
They use the identical expression. Kc uses concentrations measured at equilibrium, while Q uses concentrations at any instant. Comparing Q to Kc tells you which direction the reaction will shift.
No. Pure solids and pure liquids have activities of 1 and are left out of the Kc expression. Only include aqueous and gaseous species, so omit them from both lists.
In the standard convention concentrations are expressed relative to a 1 mol/L standard state, so the units cancel and Kc is reported as a pure number.
Tunnetaan myös nimellä
TG we-Calculate Editorial Team. (2026). Equilibrium Constant (Kc) Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/fi/calculator/equilibrium-constant-calculator
TG we-Calculate Editorial Team. "Equilibrium Constant (Kc) Calculator." TG we-Calculate. 2026. https://we-calculate.com/fi/calculator/equilibrium-constant-calculator.
TG we-Calculate Editorial Team, "Equilibrium Constant (Kc) Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/fi/calculator/equilibrium-constant-calculator
@misc{wecalculate_equilibrium_constant_calculator, title = {Equilibrium Constant (Kc) Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/fi/calculator/equilibrium-constant-calculator}}, year = {2026}, note = {TG we-Calculate} }
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