STEMFACT: Conductivity – Short Notes with Formula --- 🔹

Wednesday, 25 June 2025

⚡ Conductivity – Short Notes with Formula --- 🔹

1. Specific Conductivity (κ)

📘 Definition: It is the conductance of a solution kept between two electrodes of 1 cm² area and 1 cm apart.

📏 Formula:

κ = (1/R) × (l/A)

= Specific conductivity (S/cm) = Resistance (ohm) = Distance between electrodes (cm) = Area of cross-section (cm²) $

📐 Unit: S cm⁻¹ ---

🔹 2. Molar Conductivity (Λₘ)

📘 Definition: Conductivity of 1 mole of electrolyte in a given volume of solution.

🧪 Formula:

Λ_m = (κ × 1000) / C

= Molar conductivity (S cm² mol⁻¹) = Specific conductivity (S/cm) = Molar concentration (mol/L)$

📐 Unit: S cm² mol⁻¹ ---

🔹 3. Equivalent Conductivity (Λ_eq)

📘 Definition: Conductivity of a solution containing 1 gram equivalent of electrolyte.

🧪 Formula:

Λ_eq = (κ × 1000) / N

= Equivalent conductivity (S cm² eq⁻¹) = Specific conductivity = Normality (eq/L) $

📐 Unit: S cm² eq⁻¹

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