An increase in equivalent conductance of a strong electrolyte with dil...
Dilution of strong electrolytes increases ionisation, hence ionic mobility of ions which in turn increases equivalent conductance of the solution.
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An increase in equivalent conductance of a strong electrolyte with dil...
Explanation:
When a strong electrolyte is dissolved in a solvent, it dissociates completely into ions. The equivalent conductance of a strong electrolyte is a measure of its ability to conduct electricity, and it depends on the concentration of ions in the solution as well as their mobility.
Increase in ionic mobility of ions:
Ionic mobility refers to the ability of ions to move through the solution under the influence of an electric field. As the concentration of the electrolyte decreases with dilution, the interactions between the ions and the solvent molecules decrease. This leads to an increase in the ionic mobility of the ions, as they are able to move more freely through the solution. Therefore, an increase in the equivalent conductance of a strong electrolyte with dilution can be mainly attributed to an increase in the ionic mobility of ions.
100% ionisation of electrolyte at normal dilution:
The ionisation of a strong electrolyte is already 100% at any concentration. Dilution does not affect the degree of ionisation of the electrolyte. Therefore, this option is not correct.
Increase in both i.e. number of ions and ionic mobility of ions:
Dilution does increase the number of ions in the solution, as the concentration of the electrolyte decreases. However, this increase in the number of ions alone does not explain the increase in the equivalent conductance of the strong electrolyte. It is the increase in the ionic mobility of the ions that primarily contributes to the increase in the equivalent conductance.
Increase in number of ions:
As mentioned earlier, dilution does result in an increase in the number of ions in the solution. However, this increase in the number of ions alone does not explain the increase in the equivalent conductance of the strong electrolyte. It is the increase in the ionic mobility of the ions that primarily contributes to the increase in the equivalent conductance.
Therefore, the correct answer is option 'A', which states that the increase in equivalent conductance of a strong electrolyte with dilution is mainly due to an increase in the ionic mobility of ions.