The equivalent conductances of two strong electrolytes at infinite dilution in $H_2O$ (where ions move freely through a solution) at $25 ^\circ C$ are given below:
$\Lambda _{CH_3COONa}^o = 91.0 \ S \ cm^2 / equiv.$
$\Lambda _{HCl}^o = 426.2 \ S \ cm^2 / equiv.$
What additional information/quantity one needs to calculate $\Lambda ^o$ of an aqueous solution of acetic acid?

• A
  $\Lambda ^o$ of chloroacetic acid $(ClCH_2COOH)$
• B
  $\Lambda ^o$ of $NaCl$
• C
  $\Lambda ^o$ of $CH_3COOK$
• D
  The limiting equivalent conductance of $H^{+} ( \lambda _{H^{+}}^o )$