Solutions have higher boiling point than pure solvent {boiling point elevation}|, because solute molecules are heavier than solvent molecules and have lower volatility. If liquid includes impurities that are less volatile than liquid, liquid boils only at higher temperature. Salt in water raises boiling temperature. Mixture boiling point is higher, because mixtures are more random, so difference between liquid and gas is less. Immiscible substances lower boiling point, because both vapor pressures add to increase pressure. In boiling-point elevation, temperature change dT equals constant k times molality M: dT = K*M. People know constants for solutes and solvents.
Physical Sciences>Chemistry>Inorganic>Phase>Solution>Partial
5-Chemistry-Inorganic-Phase-Solution-Partial
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Date Modified: 2022.0224