What is Molar Conductivity?
Molar conductivity is a measure of the ability of a substance to conduct electricity in solution. It is defined as the conductivity of a solution containing one mole of the substance in question. Molar conductivity is usually denoted by the symbol Λm and is expressed in units of Siemens per meter squared per mole (S m² mol⁻¹).
The molar conductivity of a solution increases with the decrease in concentration. This increase in molar conductivity is because of the rise in the total volume containing one mole of the electrolyte. When the electrolyte concentration approaches zero, the molar conductivity is known as the limiting molar conductivity, Λ°m. Kohlrausch’s Law is based on molar conductivity and is widely used to study dilute liquids and electrolyte solutions.
Kohlrausch Law
Kohlrausch’s law, also known as the law of Independent migration of Ions, tells us that the total of the limiting molar conductance of cations and anions of an electrolyte is equal to the molar conductivity of that electrolyte. This law helps us study electrochemical cells and diluted liquids and is applicable in determining weak electrolytes’ molar conductivity.
In this article, we will learn the concepts of Kohlrausch law, its applications, etc. We have to study Kohlrausch Law in Class 12 for board exams.
Table of Content
- What is Kohlrausch’s Law?
- What is Molar Conductivity?
- Formula of Kohlrausch law
- Kohlrausch’s Law of Independent Migration
- Application of Kohlrausch’s Law