Boiling Point Elevation Calculator
Calculate boiling point change: delta_Tb = Kb x m x i.
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Enter the ebullioscopic constant (Kb) of the solvent, the molality of the solution, and the van't Hoff factor. For water, Kb = 0.512 C/m. The calculator computes delta_Tb = Kb x m x i.
About the Boiling Point Elevation Calculator
Boiling point elevation is a colligative property: the boiling point of a solution is higher than that of the pure solvent. The increase depends on the number of dissolved particles (not their identity), making it useful for determining molar mass of unknown solutes and understanding solution behavior.
Frequently Asked Questions
What is Kb for water?
The ebullioscopic constant for water is 0.512 C/m. Other solvents have different Kb values: benzene is 2.53, ethanol is 1.22, chloroform is 3.63.
Why does adding solute raise the boiling point?
Solute particles lower the vapor pressure of the solvent. Since boiling occurs when vapor pressure equals atmospheric pressure, the solution must be heated to a higher temperature to boil.
What is the van't Hoff factor?
The van't Hoff factor (i) accounts for the number of particles a solute produces in solution. For non-electrolytes like sugar, i = 1. For NaCl, i is approximately 2. For CaCl2, i is approximately 3.