1. What is the Equilibrium Constant Kc?

The equilibrium constant (Kc) is a ratio of the concentrations of products to reactants at equilibrium, with each concentration raised to the power of its stoichiometric coefficient. It indicates the extent of a chemical reaction at equilibrium.

2. How Does the Calculator Work?

The calculator uses the equilibrium constant formula:

Where:

• \( [Products] \) — Concentration of products at equilibrium (mol/L)
• \( [Reactants] \) — Concentration of reactants at equilibrium (mol/L)

Explanation: Kc is dimensionless and provides information about the position of equilibrium. A large Kc (>1) favors products, while a small Kc (<1) favors reactants.

3. Importance of Kc Calculation

Details: Kc is fundamental in chemical equilibrium studies, helping predict reaction direction, extent, and the effect of changing conditions (Le Chatelier's Principle).

4. Using the Calculator

Tips: Enter equilibrium concentrations of products and reactants in mol/L. Reactant concentration must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Kc and Kp?
A: Kc uses concentrations (mol/L) while Kp uses partial pressures (atm) for gaseous reactions.

Q2: How do stoichiometric coefficients affect Kc?
A: Coefficients become exponents in the equilibrium expression. For aA + bB ⇌ cC + dD, Kc = ([C]^c[D]^d)/([A]^a[B]^b).

Q3: Does Kc change with temperature?
A: Yes, Kc is temperature-dependent. It changes if temperature changes but remains constant for a given temperature regardless of concentration changes.

Q4: What does it mean when Kc = 1?
A: When Kc = 1, the concentrations of products and reactants are equal at equilibrium.

Q5: Can Kc be negative?
A: No, Kc is always positive since concentrations are always positive values.