kokepunktøkningsfaktoren

The kokepunktøkningsfaktoren, often translated as the ebullioscopic constant or molal boiling point elevation constant, is a physical property of a solvent. It quantifies the extent to which the boiling point of a solvent is raised when one mole of a non-volatile solute is dissolved in one kilogram of that solvent. This constant is specific to each solvent and is independent of the solute's identity, depending only on the solvent's properties.

The relationship between the change in boiling point and the molality of the solution is described by the formula ΔTb = Kb * m, where ΔTb is the increase in boiling point, Kb is the kokepunktøkningsfaktoren, and m is the molality of the solution (moles of solute per kilogram of solvent). This phenomenon, known as boiling point elevation, is a colligative property, meaning it depends on the number of solute particles, not their chemical nature.

The kokepunktøkningsfaktoren can be determined experimentally or calculated from thermodynamic data. It is an important parameter in physical chemistry and is used in various applications, including determining the molar mass of unknown solutes and understanding solution behavior. For example, water has a kokepunktøkningsfaktoren of approximately 0.512 °C kg/mol. Therefore, dissolving one mole of a non-volatile solute in one kilogram of water would raise its boiling point by 0.512 °C.