Forward Rate Constant Formula:
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Definition: This calculator determines the forward reaction rate constant based on the equilibrium constant and backward reaction rate constant for a second-order reaction.
Purpose: It helps chemists and chemical engineers understand reaction kinetics and predict reaction rates.
The calculator uses the formula:
Where:
Explanation: The forward rate constant is directly proportional to both the equilibrium constant and the backward rate constant.
Details: Understanding rate constants is crucial for reaction mechanism studies, reactor design, and process optimization in chemical industries.
Tips: Enter the equilibrium constant (Keq) and backward rate constant (kb'). The default value for kb' is 3.78×10⁻⁷ m³/mol·s. All values must be > 0.
Q1: What units are used for the rate constants?
A: For second-order reactions, the units are typically cubic meters per mole-second (m³/mol·s).
Q2: How is the equilibrium constant related to rate constants?
A: The equilibrium constant (Keq) equals the ratio of forward to backward rate constants (kf/kb).
Q3: What's a typical value for kb' in second-order reactions?
A: Backward rate constants vary widely but often fall in the range of 10⁻⁶ to 10⁻⁸ m³/mol·s for many reactions.
Q4: Can this calculator be used for first-order reactions?
A: No, this specific formula applies only to second-order reactions. First-order reactions use different units (s⁻¹).
Q5: How does temperature affect these calculations?
A: Rate constants and equilibrium constants are temperature-dependent, so values should be determined at the same temperature.