Boiling point elevation calculator
Boiling point rises in proportion to the molality of dissolved particles, whatever they are.
mol/kg
K kg/mol
Water: 0.512. Benzene: 2.53. Ethanol: 1.22.
Particles per formula unit: 1 for sugar, 2 for NaCl, 3 for CaCl2.
New boiling point
100.512°C
- Elevation
- 0.5120 K
Show the working
- Molality = 1
- Ebullioscopic constant = 0.512
- Van't Hoff factor = 1
- Normal boiling point = 100
- Elevation = 1 * 0.512 * 1 = 0.512
- New boiling point = 100 + 0.512 = 100.512
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- delta T = i x Kb x molality
- new boiling point = normal boiling point + delta T
Salting pasta water at any realistic rate raises the boiling point by a fraction of a degree; it is done for flavour, not for speed.