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Boiling-point elevation
From Wikipedia, the free encyclopedia
Boiling-point elevation is a colligative property that states that a solution will have a higher boiling point than that of a pure solvent after the addition of a dissolved solute. The change in boiling point can be determined by the equation ΔTB.P.=i·Kb·m, where m is the molality of the solute, i is the Van 't Hoff factor (the number of dissolved particles the solute will create when dissolved), and Kb is the ebullioscopic constant unique to each solvent.
A common mis-attribution of the use of boiling-point elevation is adding salt when cooking foods to elevate the temperature of the water before it boils. However, the temperature increase caused by the amounts of salt added when cooking is generally not enough to raise the temperature by a single degree, as a comparison, seawater has a boiling point of 100.6°C. The salt is added simply to season the food and prevent pasta from sticking.
A somewhat more involved derivation of the boiling-point elevation formula. [1]
SOLUTION • Ideal solution • Aqueous solution • Solid solution • Flory-Huggins • Mixture • Suspension (chemistry) • Colloid • Phase diagram • Eutectic point • Alloy
CONCENTRATION • Saturation (chemistry) • Supersaturated • Molar solution • Percentage solution
SOLUBILITY • Solubility equilibrium • Total dissolved solids • Dissolve • Solvation • Enthalpy change of solution • Lattice energy • Henry's law • Solubility table (data) • Solubility chart
SOLVENT (category) • Acid dissociation constant • Protic solvent • Inorganic nonaqueous solvent • Solvation • Solvation shell • List of boiling and freezing information of solvents
Partition coefficient • Polarity • Hydrophobe • Hydrophile • Lipophilic • Amphiphile