How does the Equilibrium Constant Kc work?

Write the balanced equation Then: Kc = [Products]^coefficients / [Reactants]^coefficients Then: Solids and pure liquids are excluded (activity = 1) Then: Reaction quotient Q compared to Kc tells direction of reaction.

Can you give an example of how to use the Equilibrium Constant Kc?

Example: Input N₂ + 3H₂ ⇌ 2NH₃ at equilibrium: [N₂]=0.1, [H₂]=0.2, [NH₃]=0.5M gives a result of Kc = [0.5]²/([0.1][0.2]³) = 312.5 (Large Kc → strong product favour).

Is the Equilibrium Constant Kc free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Equilibrium Constant Kc?

Our Equilibrium Constant Kc uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Практичне

Equilibrium Constant Kc

⚗️Equilibrium Constant (Kc)

Product concentrations (comma separated, mol/L)

Reactant concentrations (comma separated, mol/L)

The equilibrium constant (Kc) quantifies the ratio of product to reactant concentrations at equilibrium for a reversible reaction. Kc > 1 means products are favoured; Kc < 1 means reactants are favoured.

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Did You Know?

The Haber process (N₂ + 3H₂ → 2NH₃) uses Le Chatelier's principle: high pressure and moderate temperature (despite less favourable equilibrium) maximize ammonia output and productivity.

References

›Equilibrium constant — Wikipedia

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Equilibrium Constant Kc

⚗️Equilibrium Constant (Kc)

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⚗️Equilibrium Constant (Kc)