Q2 / 120 · VITEEE 2010 · Chemistry

The equivalent conductance at infinite dilution of a weak acid such as $\mathrm{HF}$

A
can be determined by extrapolation of measurements on dilute solutions of $\mathrm{HCl}$, HBr and HI
B
can be determined by measurement on very dilute HF solutions
Correct answer
C
can best be determined from measurements on dilute solutions of $\mathrm{NaF}, \mathrm{NaCl}$ and $\mathrm{HCl}$
D
is an undefined quantity

Solution

According to Kohlrausch's law, equivalent conductance at infinite dilution of HF, $$ \Lambda_{\mathrm{HF}}^{\circ}=\Lambda_{\mathrm{NaF}}^{\circ}+\Lambda_{\mathrm{HCl}}^{\circ}-\Lambda_{\mathrm{NaCl}}^{\circ} $$

Hence, the correct answer is option: 'C'.

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