The molar conductivities $\bigwedge^{\circ} NaOAc$ and $ \bigwedge^{\circ} HCl$ at infinite dilution in water at $25^{\circ}C$ are $91.0$ and $426.2\; S\; cm^2/mol$ respectively. To calculate $ \bigwedge^{\circ} HOAc$, the additional value required is :