Equilibrium Constant Formula:
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Definition: The equilibrium constant (Kc) is the value of its reaction quotient at chemical equilibrium, relating the concentrations of products and reactants at equilibrium.
Purpose: This calculator helps determine the equilibrium constant based on thermodynamic properties (enthalpy and entropy changes) at a given temperature.
The calculator uses the formula:
Where:
Explanation: The formula relates thermodynamic properties to the equilibrium position of a chemical reaction.
Details: The equilibrium constant is crucial for predicting reaction direction, extent of reaction, and understanding chemical systems at equilibrium.
Tips: Enter the change in enthalpy (ΔH), change in entropy (ΔS), and temperature in Kelvin. Temperature must be > 0.
Q1: What does a large Kc value indicate?
A: A large Kc (>1) indicates the reaction favors product formation at equilibrium.
Q2: How does temperature affect Kc?
A: For endothermic reactions (ΔH > 0), Kc increases with temperature. For exothermic reactions (ΔH < 0), Kc decreases with temperature.
Q3: What units should I use for ΔH and ΔS?
A: Use consistent energy units (J/kg for ΔH and J/kg·K for ΔS) for accurate results.
Q4: Can Kc be negative?
A: No, equilibrium constants are always positive values.
Q5: What's the difference between Kc and Kp?
A: Kc uses concentrations while Kp uses partial pressures, but they're related through the ideal gas law.