25: Solutions II - Solid-Liquid Solutions
- Page ID
- 11821
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- 25.3: Colligative Properties Depend only on Number Density
- Colligative properties are properties that depend on the number of particles rather than their total mass. This implies that these properties can be used to measure molar mass. Colligative properties include: melting point depression boiling point elevation osmotic pressure.
- 25.4: Osmotic Pressure can Determine Molecular Masses
- Osmometry is still of some practical usefulness. It is also colligative and able to measure up to about 8000 daltons. Many polymers are much bigger than that. Their mass distribution is usually determined by different means.