Electrochemistry - Result Question 6
####7. An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:
[2010]
(a) increase in ionic mobility of ions
(b) $100 %$ ionisation of electrolyte at normal dilution
(c) increase in both i.e. number of ions and ionic mobility of ions
(d) increase in number of ions
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Solution:
- (a) Strong electrolytes are completely ionised at all concentrations. On increasing dilution, the number of ions remains the same but the ionic mobility increases. $\lambda _{e q}^{c}=\frac{K}{N}=\frac{\text{ Conductivity }}{\text{ Normality }}$
On increasing dilution, both conductivity and normality decreases. But the decreases in conductivity is more than compensated by decrease in its normality. Hence, effectively $\lambda _{e q}^{c}$ increases on dilution.
