Melting Point:
* Pure Water: The melting point of pure water is 0°C (32°F).
* Sugar-Water Solution: The melting point of a sugar-water solution is lower than that of pure water. This is because the dissolved sugar molecules disrupt the hydrogen bonds between water molecules, making it slightly easier for the solution to transition from a solid to a liquid state. The exact freezing point depression depends on the concentration of sugar.
Boiling Point:
* Pure Water: The boiling point of pure water is 100°C (212°F) at standard atmospheric pressure.
* Sugar-Water Solution: The boiling point of a sugar-water solution is higher than that of pure water. This is due to a phenomenon called boiling point elevation. The dissolved sugar molecules create a higher concentration of dissolved particles, requiring more energy to overcome the intermolecular forces and transition to a gaseous state. The higher the concentration of sugar, the higher the boiling point elevation.
Key Points:
* Colligative Properties: Melting point depression and boiling point elevation are examples of colligative properties. These properties depend solely on the number of solute particles dissolved in a solvent, not on the nature of those particles.
* Concentration Matters: The extent to which the melting point is depressed and the boiling point is elevated depends on the concentration of the sugar solution. More concentrated solutions experience a greater change in these properties.
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