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A one molal solution of sodium chloride in water has the same boiling point as
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$1 \mathrm{~m}$ solution of magnesium sulphate
$\Delta T_{b}=i K_{b} m$
Two solutions having same molality and same van' $t$ Hoff factors will have same elevation in boiling points $\left(\Delta T_{b}\right)$ and thus, have same boiling points $\left(T_{b}\right)$.
For NaCl,$i=2 ; \mathrm{MgSO}_{4}, i=2 ; \mathrm{MgCl}_{2}, i=3$;
$\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}, i=5$ and $\mathrm{AlCl}_{3}, i=4$.
Thus, one molal solution of sodium chloride in water has the same boiling point as one molal solution of $\mathrm{MgSO}_{4}$.
Two solutions having same molality and same van' $t$ Hoff factors will have same elevation in boiling points $\left(\Delta T_{b}\right)$ and thus, have same boiling points $\left(T_{b}\right)$.
For NaCl,$i=2 ; \mathrm{MgSO}_{4}, i=2 ; \mathrm{MgCl}_{2}, i=3$;
$\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}, i=5$ and $\mathrm{AlCl}_{3}, i=4$.
Thus, one molal solution of sodium chloride in water has the same boiling point as one molal solution of $\mathrm{MgSO}_{4}$.
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