ΔTb=iKbm Two solutions having same molality and same van't Hoff factors will have same elevation in boiling points t(ΔTb) and thus, have same boiling points (Tb). For NaCl,i=2;MgSO4,i=2;MgCl2,i=3; Al2(SO4)3,i=5‌and‌A‌C‌l3,i=4 Thus, one molal solution of sodium chloride in water has the same boiling point as one molal solution of MgSO4