How to Calculate Boiling Point Elevation
What is Boiling Point Elevation?
Boiling point elevation is a colligative property: dissolving a solute raises the boiling point of the solvent. ΔTb = i × Kb × m. For water, Kb = 0.512 °C·kg/mol.
Step-by-Step Guide
- 1ΔTb = i × Kb × m
- 2Kb(water) = 0.512 °C·kg/mol
- 3Higher solute concentration and ionic dissociation → larger elevation
Worked Examples
Input
0.5 mol sucrose in 1 kg water · i=1 · Kb=0.512
Result
ΔTb = 0.256°C → boils at 100.256°C
1×0.512×0.5=0.256°C
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