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Question: Answered & Verified by Expert
The molar conductivities of $\mathrm{HCl}, \mathrm{NaCl}, \mathrm{CH}_{3} \mathrm{COOH}$, and $\mathrm{CH}_{3} \mathrm{COONa}$ at infinite dilution follow the order
ChemistryElectrochemistryKVPYKVPY 2015 (SB/SX)
Options:
  • A $\mathrm{HCl}>\mathrm{CH}_{3} \mathrm{COOH}>\mathrm{NaCl}>\mathrm{CH}_{3} \mathrm{COONa}$
  • B $\mathrm{CH}_{3} \mathrm{COONa}>\mathrm{HCl}>\mathrm{NaCl}>\mathrm{CH}_{3} \mathrm{COOH}$
  • C $\mathrm{HCl}>\mathrm{NaCl}>\mathrm{CH}_{3} \mathrm{COOH}>\mathrm{CH}_{3} \mathrm{COONa}$
  • D $\mathrm{CH}_{3} \mathrm{COOH}>\mathrm{CH}_{3} \mathrm{COONa}>\mathrm{HCl}>\mathrm{NaCl}$
Solution:
1099 Upvotes Verified Answer
The correct answer is: $\mathrm{HCl}>\mathrm{CH}_{3} \mathrm{COOH}>\mathrm{NaCl}>\mathrm{CH}_{3} \mathrm{COONa}$
$\lambda_{\infty} \quad \mathrm{CH}_{3} \mathrm{COO}^{-}=40.9 \times 10^{-4} \quad \mathrm{Sm}^{2} \quad \mathrm{~mol}^{-1}$
$\lambda_{\infty} \quad \mathrm{Na}^{+}=50.10 \times 10^{-4} \quad \mathrm{Sm}^{2} \mathrm{~mol}^{-1}$
$\lambda_{\infty} \quad \mathrm{Cl}^{-} \quad=\quad 76.35 \times 10^{-4} \quad \mathrm{Sm}^{2} \quad \mathrm{~mol}^{-1}$
$\lambda_{\infty} \quad \mathrm{H}^{+}=349 \times 10^{-4} \quad \mathrm{Sm}^{2} \quad \mathrm{~mol}^{-1}$
$\lambda_{x} \mathrm{HCl}=\lambda_{u^{t}}+\lambda_{\mathrm{c}^{-}} / \lambda_{\mathrm{Cl}, \mathrm{coon}}=\lambda_{\mathrm{al}, \mathrm{coo}^{-}}+\lambda_{\mathrm{u}^{+}}$
$\lambda_{\mathrm{Ncl}}=\lambda_{\mathrm{N}}+\lambda_{\mathrm{c} \mathrm{r}^{-}} / \lambda_{\mathrm{CH}_{3} \mathrm{com} \mathrm{N}}=\lambda_{\mathrm{CH}_{3} \mathrm{coo}^{-}}+\lambda_{\mathrm{N}^{+}}$
$\lambda_{\text {HC }}=425.35 \mathrm{sm}^{2} / \mathrm{mol}$
$\lambda_{\mathrm{cH}_{3} \mathrm{coon}}=389.9 \mathrm{sm}^{2} / \mathrm{mol}$
$\lambda_{\text {Nacl }}=126.45 \mathrm{sm}^{2} / \mathrm{mol}$
$\lambda_{\mathrm{Cl}, \mathrm{coON}}=91 \mathrm{sm}^{2} / \mathrm{mol}$

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