Kohlrausch's law and applications
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See all →- If the molar conductivity (_m) of a 0.050 mol L^-1 solution of a monobasic weak acid is 90 S cm^2 mol^-1, its extent (degree) of dissociation will be[Assume ^°_+ = 349.6 S cm^2 mol^-1 and ^°_- = 50.4 S cm^2 mol^-1.] Answer: 3. 0.225 Key idea: α=Lambda_m/Lambda^°_m for a weak electrolyte. Lambda^°_m=349.6+50.4=400 S cm² mol⁻¹. α=90/400=0.225 . Option (3). 1
- The molar conductance of NaCl, HCl and CH_3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm^2 mol^-1 respectively. The molar conductance of CH_3COOH at infinite dilution is. Choose the right option for your answer. Answer: 2. 390.71 S cm ² mol ⁻¹ Key idea: Kohlrausch's law of independent migration of ions. Lambda^°(CH₃COOH)=Lambda^°(CH₃COONa)+Lambda^°(H... 1