Λm = κ/c in S·cm²/mol and S·m²/mol, with optional α = Λm/Λ°m and Ka for weak electrolytes.
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Key facts
Category
Science & Education
Input types
number, select
Output type
text
Sample coverage
4
API ready
Yes
Overview
The Molar Conductivity Calculator determines electrolyte molar conductivity (Λm = κ/c) in S·cm²/mol and S·m²/mol from measured solution conductivity and concentration. By optionally providing the limiting molar conductivity (Λ°m), it also computes the degree of dissociation (α) and the acid dissociation constant (Ka) for 1:1 weak electrolytes via Ostwald's dilution law.
When to use
Converting raw electrical conductivity measurements into normalized molar conductivity values across various unit systems.
Evaluating electrolyte behavior to differentiate between strong electrolytes and weakly dissociating species.
Calculating the degree of dissociation (α) and equilibrium constant (Ka) for weak acids or bases using conductometric data.
How it works
1Enter the measured electrolytic conductivity (κ) and select the appropriate unit (µS/cm, mS/cm, or S/m).
2Specify the solution concentration (c) and select its unit (mol/L, mmol/L, or µmol/L).
3Optionally enter the limiting molar conductivity (Λ°m) in S·cm²/mol to determine dissociation metrics.
4The tool normalizes units, calculates Λm = κ/c, and determines α = Λm/Λ°m and Ka = cα²/(1−α) when Λ°m is provided.
Use cases
Physical chemistry lab students analyzing conductivity data to find the Ka of weak acids like acetic acid.
Researchers validating ionic mobility and Kohlrausch limiting conductivity laws for standard salts such as KCl.
Analytical chemists converting conductivity probe readings into normalized molar metrics across varying sample dilutions.