Molar conductivity of 0.02 M weak acid is $7.92 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ and its molar…

Molar conductivity of 0.02 M weak acid is $7.92 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ and its molar conductivity at infinite dilution is $232.7 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$. Calculate degree of dissociation of weak acid.
  1. 0.0112
  2. 0.0341
  3. 0.0694
  4. 0.292

Solution

Degree of dissociation $(\alpha)=\frac{\wedge_c}{\wedge_0}$ $=\frac{7.92 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}}{232.7 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}}=0.0341$

Asked in: MHT CET 2024 (09 May Shift 1)

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