Question

What is the relationship between degree of dissociation and molar conductivity?

Answer 1

1. Molar conductivity is defined as the ratio of specific conductivity over molar concentration.
2. There are generally two types of electrolytes: Strong and Weak electrolytes.
3. Molar conductivity helps in measuring the efficiency of a given electrolyte in a solution.
4. Molar conductivity is denoted as ${\mathrm{\lambda }}_{\mathrm{m}}$
5. On diluting the strong electrolytes, the molar conductivity increases, because of solute-solute interaction.
6. The degree of dissociation is defined as the fraction of solute molecules which is dissociated in the solution.
7. The degree of dissociation is represented as$\propto$.
8. At a given concentration the degree of dissociation of weak electrolytes is related to the molar conductivity is given as follows:
   $\propto =\frac{{\mathrm{\lambda }}_{\mathrm{c}}}{{\mathrm{\lambda }}_0}$; where ${\mathrm{\lambda }}_{\mathrm{c}}$is the molar conductivity of weak electrolyte( concentration “c”), and ${\mathrm{\lambda }}_0$ is the molar conductivity of weak electrolyte at 0 concentration.