An increase in equivalent conductance of a strong electrolyte with dil...
Equivalent conductance increases on dilution for a strong electrolyte because of increase in mobility of ions.
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An increase in equivalent conductance of a strong electrolyte with dil...
Understanding Equivalent Conductance in Strong Electrolytes
When a strong electrolyte is diluted, its equivalent conductance increases primarily due to the enhanced ionic mobility of the ions. Here’s a breakdown of the reasons:
What is Equivalent Conductance?
- Equivalent conductance (Λ) is a measure of the ability of an electrolyte solution to conduct electricity.
- It is directly proportional to the concentration of ions in the solution and their mobility.
Effects of Dilution on Strong Electrolytes
- **Dilution** reduces the concentration of ions in the solution.
- Despite the decrease in the number of ions per unit volume, the conductance increases because the ions become more mobile.
Reasons for Increased Ionic Mobility
- As the solution is diluted:
- **Ionic Interactions**: The ions experience less interaction with each other, as the distance between them increases. This reduced interaction allows them to move more freely.
- **Decreased Viscosity**: The viscosity of the solution decreases with dilution, facilitating easier movement of ions.
Why Other Options are Incorrect
- **Option A**: The number of ions does not increase with dilution; it decreases.
- **Option B**: Although both factors play a role in conductance, the primary reason for the increase in equivalent conductance is the enhanced mobility of the ions.
- **Option C**: Strong electrolytes are fully ionized even at normal dilution; thus, 100% ionization is not a factor influencing the increase in conductance.
Conclusion
In summary, the primary reason for the increase in equivalent conductance of a strong electrolyte upon dilution is the increase in the ionic mobility of the ions, making option 'D' the correct answer.