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Definition: This calculator determines the equilibrium constant at initial temperature based on known values at a different temperature and the heat of reaction.
Purpose: It helps chemical engineers and researchers predict how equilibrium constants change with temperature for chemical reactions.
The calculator uses the van't Hoff equation:
Where:
Explanation: The equation relates the change in equilibrium constant with temperature to the enthalpy change of the reaction.
Details: Understanding how equilibrium constants vary with temperature is crucial for reactor design, process optimization, and predicting reaction yields.
Tips: Enter the known equilibrium constant (K₂), heat of reaction (ΔHᵣ), and both temperatures in Kelvin. All values must be > 0.
Q1: What is the significance of the heat of reaction?
A: The heat of reaction (ΔHᵣ) determines how sensitive the equilibrium constant is to temperature changes.
Q2: Why must temperatures be in Kelvin?
A: The equation requires absolute temperature for thermodynamic consistency.
Q3: What does a negative heat of reaction indicate?
A: A negative ΔHᵣ means the reaction is exothermic (releases heat), while positive means endothermic (absorbs heat).
Q4: How accurate is this calculation?
A: It assumes ΔHᵣ is constant over the temperature range. For large ranges, consider temperature-dependent ΔHᵣ.
Q5: Can I use this for any equilibrium reaction?
A: Yes, as long as you have the required parameters, it works for any chemical equilibrium.