Formula Used:
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Definition: This calculator determines the initial concentration of reactant [A]0 for a series reaction where the first step is first order followed by a zero order reaction, using intermediate concentration measurements.
Purpose: It helps chemical engineers and researchers analyze reaction kinetics and determine initial conditions for complex reaction systems.
The calculator uses the formula:
Where:
Explanation: The formula accounts for both the first order decay of the initial reactant and the zero order formation of the intermediate product.
Details: Accurate determination of initial reactant concentration is crucial for reaction modeling, process optimization, and kinetic studies in chemical engineering.
Tips: Enter the intermediate concentration, both rate constants, and the time interval. All values must be positive, with time and first order rate constant > 0.
Q1: What types of reactions does this calculator apply to?
A: It's designed for series reactions where the first step is first order and the second step is zero order.
Q2: How do I determine the intermediate concentration?
A: This is typically measured experimentally at a specific time point during the reaction.
Q3: What units should I use for input values?
A: Use consistent SI units: mol/m³ for concentrations, seconds for time, and corresponding rate constant units.
Q4: Can this be used for reversible reactions?
A: No, this calculator assumes irreversible reaction steps.
Q5: What if I get negative or infinite results?
A: Check your input values. Time interval and first order rate constant must be positive.