Difference Between Conductivity and Molar Conductivity

Thekey differencebetween conductivity and molar conductivity is thatconductivity is the measure of the ability of anelectrolyteto conduct electricity whereas the molar conductivity is the conductivity of an electrolyte measured per unit molar concentration.

Conductivity measures the ability of an electrolyte to conductelectricitythrough it. In other words, it is a quantitative measure of the conductance of an electrolyte. The ionic species in the electrolyte, i.e.,cations and anions, contribute to the conductivity.

1.Overview and Key Difference
2.What is Conductivity
3.What is Molar Conductivity
4.Side by Side Comparison – Conductivity vs Molar Conductivity in Tabular Form
5.概括

什么是电导率？

Conductivity is the measure of an electrolyte’s ability to conduct electricity through it. An electrolyte is a substance that can produce a solution that has the ability to conduct electricity when we dissolve it in a polar solvent such as water. Therefore, the electrolyte should produce ionic species upon dissolving: cations or positive charged ions and anions or negative charged ions.

Difference Between Conductivity and Molar Conductivity

图1：电导率计

The SI unit for the measurement of conductivity is S/m (Siemens per meter). Usually, we measure this at 25°C temperature. However, in industries, we use this often as μS/cm, as a traditional unit. We can determine the conductivity of an electrolytic solution by determining the resistance of the solution between two flat electrodes separated by a fixed distance. Here, we should use an alternating current in order to avoid electrolysis. Furthermore, we can measure this resistance using a conductivity meter.

What is Molar Conductivity?

摩尔电导率是每单位摩尔浓度溶液测量的电解溶液的电导率。我们可以确定这是电解溶液的电导率，除以电解质的摩尔浓度。因此，我们可以在以下方程式中给出摩尔电导率：

摩尔电导率= k/c

k is the measured conductivity of the electrolytic solution and c is the concentration of the electrolytic solution.

What is the Difference Between Conductivity and Molar Conductivity?

Conductivity is the measure of an electrolyte’s ability to conduct electricity through it while molar conductivity is the conductivity of an electrolytic solution measured per unit molar concentration of the solution. Therefore, this is the key difference between conductivity and molar conductivity. Here, we do not consider the molar concentration of the electrolytic solution when determining the conductivity. However, we should consider the concentration of the electrolytic solution when determining the molar conductivity.

The below illustration shows more details on the difference between conductivity and molar conductivity.

概括– Conductivity vs Molar Conductivity

Molar conductivity is a derivative of conductivity which includes the molar concentration of the electrolytic solution in which we measure the conductivity. In brief, conductivity is the measure of the ability of an electrolyte to conduct electricity. Molar conductivity, on the other hand, is the conductivity of an electrolyte measured per unit molar concentration. Therefore, this is the key difference between conductivity and molar conductivity.