The equivalent conductivities of two strong electrolytes at infinite dilution in H2O(where ions move freely through a solution) at 25 °C are given below:ΛCH3COONa∞=91.0Scm2/ equiv ΛHCl∞=426.2cm2/ equiv What additional information/quantity one needs to calculate of Λ∞of an aqueous solution of acetic acid?

# The equivalent conductivities of two strong electrolytes at infinite dilution in ${\mathrm{H}}_{2}\mathrm{O}$(where ions move freely through a solution) at 25 °C are given below:What additional information/quantity one needs to calculate of ${\Lambda }^{\mathrm{\infty }}$of an aqueous solution of acetic acid?

1. A

${\mathrm{\Lambda }}_{C}^{\mathrm{\infty }}$ of $\mathrm{NaCl}$

2. B

${\mathrm{\Lambda }}^{\mathrm{\infty }}$ of ${\mathrm{CH}}_{3}\mathrm{COOK}$

3. C

The limiting equivalent conductivity of ${\mathrm{H}}^{+}$

4. D

${\mathrm{\Lambda }}^{\mathrm{\infty }}$ of chloroacetic acid (${\mathrm{CICH}}_{2}\mathrm{COOH}$)

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### Solution:

We have ${\mathrm{\Lambda }}^{\mathrm{\infty }}\left({\mathrm{CH}}_{3}\mathrm{COOH}\right)={\mathrm{\Lambda }}^{\mathrm{\infty }}\left({\mathrm{CH}}_{3}\mathrm{COONa}\right)+{\mathrm{\Lambda }}^{\mathrm{\infty }}\left(\mathrm{HCl}\right)-{\mathrm{\Lambda }}^{\mathrm{\infty }}\left(\mathrm{NaCl}\right)$ Hence, the data of is required.

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