1. What is Forward Rate Constant given Keq and kb?

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.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( k_{fr}' \) — Forward reaction rate constant (m³/mol·s)
• \( K_{eq} \) — Equilibrium constant for the reaction
• \( k_{b}' \) — Backward reaction rate constant (m³/mol·s)

Explanation: The forward rate constant is directly proportional to both the equilibrium constant and the backward rate constant.

3. Importance of Rate Constant Calculation

Details: Understanding rate constants is crucial for reaction mechanism studies, reactor design, and process optimization in chemical industries.

4. Using the Calculator

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.

5. Frequently Asked Questions (FAQ)

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.