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Definition: This calculator determines the rate constant (k₁) for the first parallel reaction pathway from reactant A to product B.
Purpose: It helps chemists and chemical engineers analyze parallel reaction kinetics and determine individual reaction rates.
The calculator uses the formula:
Where:
Explanation: The natural log of the concentration ratio gives the total rate, from which we subtract the known rate constant k₂ to isolate k₁.
Details: Determining individual rate constants in parallel reactions is crucial for reaction optimization, selectivity control, and process design.
Tips: Enter the reaction time, initial concentration, current concentration, and the known rate constant k₂ (default 8.87×10⁻⁵ 1/s).
Q1: What are parallel reactions?
A: Parallel reactions occur when a reactant can form different products through simultaneous reaction pathways.
Q2: Why do we use natural logarithm in the formula?
A: The natural log relates to the integrated rate law for first-order reactions, which this calculation assumes.
Q3: What units should I use?
A: Use consistent units - seconds for time, mol/m³ for concentrations, and 1/s for rate constants.
Q4: Can k₁ be negative?
A: No, if you get a negative result, check your inputs as rate constants must be positive.
Q5: How precise should my concentration measurements be?
A: For accurate results, measure concentrations precisely as small errors can significantly affect the calculated rate constant.