The Ebullioscopic Constant ($K_b$) is defined by the formula: $K_b=\frac{R\cdot M\cdot (T_b^0{)}^2}{1000\cdot \Delta H_{vap}}$

• Where:
• $M$ is the molar mass of the solvent.
• $T_b^0$ is the boiling point of the pure solvent.
• $\Delta H_{vap}$ is the latent heat of vaporization of the solvent.
• All these terms are physical properties of the solvent. Therefore, $K_b$ is a characteristic of the solvent and does not depend on the nature of the solute dissolved in it.