Ilkovic Equation:
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Definition: This calculator determines the concentration of a depolariser using the Ilkovic equation based on polarographic measurements.
Purpose: It helps electrochemists and analytical chemists quantify the concentration of electroactive species in solution using polarography.
The calculator uses the Ilkovic equation:
Where:
Explanation: The diffusion current is proportional to the concentration of the electroactive species, with other factors accounting for experimental conditions.
Details: Accurate concentration determination is crucial for quantitative analysis, reaction kinetics studies, and electrochemical research.
Tips: Enter the measured diffusion current, number of electrons, diffusion coefficient (default 6.9×10⁻¹⁰ m²/s), mass flow rate (default 4×10⁻⁶ kg/s), and drop time (default 4 s).
Q1: What is a typical diffusion coefficient value?
A: For many ions in aqueous solution, D ranges from 10⁻⁹ to 10⁻¹⁰ m²/s, with 6.9×10⁻¹⁰ being common for many metal ions.
Q2: How do I measure the diffusion current?
A: The diffusion current is measured as the limiting current in polarography after accounting for residual current.
Q3: Why is the mass flow rate important?
A: The mercury flow rate affects the electrode surface area and thus the current magnitude.
Q4: What affects the drop time?
A: Drop time depends on capillary dimensions, mercury pressure, and solution properties.
Q5: What are common applications?
A: This calculation is used in trace metal analysis, pharmaceutical analysis, and environmental monitoring.