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ChemistryNEET 2021Conductance and Kohlrausch's law

Electrochemistry

The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol−120\ \mathrm{S\,cm^2\,mol^{-1}}. What is the dissociation constant of acetic acid? (Given λH+∘=350 S cm2 mol−1\lambda^\circ_{\mathrm{H^+}} = 350\ \mathrm{S\,cm^2\,mol^{-1}} and λCH3COO−∘=50 S cm2 mol−1\lambda^\circ_{\mathrm{CH_3COO^-}} = 50\ \mathrm{S\,cm^2\,mol^{-1}})

  1. A.1.75×10−4 mol L−11.75 \times 10^{-4}\ \mathrm{mol\,L^{-1}}
  2. B.2.50×10−4 mol L−12.50 \times 10^{-4}\ \mathrm{mol\,L^{-1}}
  3. C.1.75×10−5 mol L−11.75 \times 10^{-5}\ \mathrm{mol\,L^{-1}}✓
  4. D.2.50×10−5 mol L−12.50 \times 10^{-5}\ \mathrm{mol\,L^{-1}}

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