Keq Equation Calculator

Equilibrium Constant Equation:

\[ K_{eq} = \frac{[C]^c [D]^d}{[A]^a [B]^b} \]

Concentration of A [A]:

Exponent for A (a):

Concentration of B [B]:

Exponent for B (b):

Concentration of C [C]:

Exponent for C (c):

Concentration of D [D]:

Exponent for D (d):

Equilibrium Constant (K_eq):

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1. What is the Equilibrium Constant Equation?

The equilibrium constant (K_eq) equation describes the ratio of product concentrations to reactant concentrations at equilibrium for a chemical reaction. For a general reaction aA + bB ⇌ cC + dD, the equilibrium constant is defined as shown above.

2. How Does the Calculator Work?

The calculator uses the equilibrium constant equation:

\[ K_{eq} = \frac{[C]^c [D]^d}{[A]^a [B]^b} \]

Where:

\( [A], [B] \) — Concentrations of reactants (M)
\( [C], [D] \) — Concentrations of products (M)
\( a, b \) — Stoichiometric coefficients for reactants
\( c, d \) — Stoichiometric coefficients for products
\( K_{eq} \) — Equilibrium constant (dimensionless)

Explanation: The equation quantifies the position of equilibrium, with larger values favoring products and smaller values favoring reactants.

3. Importance of Keq Calculation

Details: The equilibrium constant is fundamental in chemical thermodynamics, predicting reaction direction, extent of reaction, and guiding industrial process optimization.

4. Using the Calculator

Tips: Enter all concentrations in molarity (M) and stoichiometric coefficients as positive numbers. Ensure concentrations are non-negative values.

5. Frequently Asked Questions (FAQ)

Q1: What does a large Keq value indicate?
A: A large Keq (>1) indicates the reaction favors product formation at equilibrium, while a small Keq (<1) favors reactants.

Q2: Is Keq temperature dependent?
A: Yes, Keq varies with temperature according to the van't Hoff equation. It's constant only at a given temperature.

Q3: What are the units of Keq?
A: Keq is typically dimensionless for concentration-based calculations, though it may have units for different equilibrium constant expressions.

Q4: When is Keq undefined?
A: Keq is undefined when any reactant concentration is zero in the denominator, as this would involve division by zero.

Q5: How does Keq relate to Gibbs free energy?
A: ΔG° = -RT ln K, where ΔG° is the standard Gibbs free energy change, R is the gas constant, and T is temperature.