What Is Molal Boiling Point Elevation Constant?
The Proportionality Constant, Kb, Is Called the Molal Boiling-Point Elevation Constant. It Is a Constant That Is Equal to the Change in the Boiling Point for a...
The proportionality constant, Kb, is called the molal boiling-point elevation constant. It is a constant that is equal to the change in the boiling point for a 1-molal solution of a nonvolatile molecular solute. For water, the value of Kb is 0.512oC/m.
What is the boiling point elevation constant?
The Boiling-Point Elevation Equation
Kb is the molal boiling-point elevation constant. The value of Kb depends on the type of solvent present and nothing else. Since it's a constant, its value is always the same; you look up Kb for the solvent involved in a solution and plug the number in.
How do you find molal boiling point elevation constant?
It can be calculated as Kb = RTb2M/ΔHv, where R is the gas constant, and Tb is the boiling temperature of the pure solvent [in K], M is the molar mass of the solvent, and ΔHv is the heat of vaporization per mole of the solvent.
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