1. What is the Depolariser Concentration Calculator?

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.

2. How Does the Calculator Work?

The calculator uses the Ilkovic equation:

Where:

• \( c \) — Concentration of depolariser (mol/m³)
• \( I_d \) — Diffusion current (A)
• \( n \) — Number of electrons transferred
• \( D \) — Diffusion coefficient (m²/s)
• \( m \) — Mass flow rate of mercury (kg/s)
• \( t \) — Drop time (s)

Explanation: The diffusion current is proportional to the concentration of the electroactive species, with other factors accounting for experimental conditions.

3. Importance of Concentration Calculation

Details: Accurate concentration determination is crucial for quantitative analysis, reaction kinetics studies, and electrochemical research.

4. Using the Calculator

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).

5. Frequently Asked Questions (FAQ)

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.