Study of boiling points is called Ebullioscopy. Ebullioscopic constant depends on

$\begin{array}{l}{\mathrm{K}}_{\mathrm{b}}=\frac{{\mathrm{RT}}_0^2}{1000{\mathrm{l}}_{\mathrm{v}}}\\ {\mathrm{K}}_{\mathrm{b}}=\frac{{\mathrm{RT}}_0^2\mathrm{M}}{1000{\mathrm{\Delta H}}_{\mathrm{v}}}\end{array}$

${\mathrm{T}}_0=$  BP of solvent
${\mathrm{l}}_{\mathrm{v}}=$ latent heat of vaporization of solvent / g
${\mathrm{\Delta H}}_{\mathrm{v}}$ = Enthalpy  of vaporization of solvent / mole
M = Molar mass of solvent;

${\mathrm{K}}_{\mathrm{b}}$ depends on solvent only