1. What is Molar Conductivity at Infinite Dilution?

Definition: Molar conductivity at infinite dilution (Λ°) is the conductivity of all ions from one mole of an electrolyte when the solution is infinitely diluted.

Purpose: It helps in understanding the conducting power of ions of an electrolyte at infinite dilution where ion-ion interactions are negligible.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \Lambda_{AB} \) — Molar conductivity at infinite dilution (S·m²/mol)
• \( u_A \) — Mobility of cation (m²/V·s)
• \( u_B \) — Mobility of anion (m²/V·s)
• \( F \) — Faraday constant (96485.33212 C/mol)

Explanation: The sum of ionic mobilities is multiplied by Faraday's constant to calculate molar conductivity.

3. Importance of Molar Conductivity Calculation

Details: This calculation is fundamental in electrochemistry for determining transport numbers, studying ion mobility, and understanding electrolyte behavior.

4. Using the Calculator

Tips: Enter the mobility values for both cation and anion in m²/V·s. Typical values range from 5×10⁻⁸ to 8×10⁻⁸ m²/V·s for common ions.

5. Frequently Asked Questions (FAQ)

Q1: What is the physical meaning of molar conductivity?
A: It represents the conducting power of all ions produced by one mole of an electrolyte at infinite dilution.

Q2: Why do we use infinite dilution?
A: At infinite dilution, interionic effects disappear and each ion contributes independently to the conductivity.

Q3: What are typical mobility values for ions?
A: For example: H⁺ (36.23×10⁻⁸), OH⁻ (20.64×10⁻⁸), Na⁺ (5.19×10⁻⁸), Cl⁻ (7.91×10⁻⁸) m²/V·s at 25°C.

Q4: How does temperature affect the calculation?
A: Ion mobility increases with temperature, so values should be adjusted for temperature differences.

Q5: What are the units of molar conductivity?
A: The SI unit is siemens meter squared per mole (S·m²/mol).