Forward Reaction Rate Constant Formula:
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Definition: The forward reaction rate constant (kf) defines the relationship between the molar concentration of reactants and the rate of the chemical reaction in the forward direction.
Purpose: This calculator determines kf when initial concentration of reactant B is greater than 0, using reaction parameters at equilibrium.
The calculator uses the formula:
Where:
Explanation: The formula accounts for reaction progress toward equilibrium and the initial concentrations of both reactants.
Details: Knowing kf helps predict reaction rates, design chemical processes, and understand reaction mechanisms.
Tips: Enter all required parameters with consistent units. Time must be > 0, equilibrium concentration > product concentration, and initial concentrations > 0.
Q1: When is this formula applicable?
A: This formula applies to reversible reactions where initial concentration of B > 0 and the system approaches equilibrium.
Q2: What if x = xeq?
A: The formula becomes undefined as the system would be at equilibrium with no net reaction.
Q3: What units should I use?
A: Use consistent units - typically seconds for time and mol/m³ for concentrations.
Q4: How does initial concentration affect kf?
A: kf is an intrinsic property, but the formula accounts for how initial concentrations affect the approach to equilibrium.
Q5: Can I use this for irreversible reactions?
A: No, this formula specifically applies to reversible reactions approaching equilibrium.