The Van't Hoff factor $\left(\mathrm{i}\right)$ for an infinitely dilute solution of ${\mathrm{NaHSO}}_4$ is:

The degree of dissociation ($\mathrm{\alpha }$) can be calculated using the formula, $\mathrm{\alpha }=\frac{d_{\mathrm{t}}-{\mathrm{d}}_0}{(\mathrm{n}-1){\mathrm{d}}_0}$

This formula is applicable at

$0.004 \mathrm{M} {\mathrm{Na}}_2{\mathrm{SO}}_4$  is isotonic with $0.01 \mathrm{M}$ glucose. Degree of dissociation of ${\mathrm{Na}}_2{\mathrm{SO}}_4$ is-