Determination of Molar Mass: Colligative properties can be used to determine the molar mass of a solute in a solution. There are several colligative properties that can be used for this purpose, including vapour pressure lowering, boiling point elevation, and freezing point depression.
The basic principle behind the use of colligative properties for molar mass determination is that the extent of the property change is proportional to the number of solute particles in the solution, not their identity. Therefore, if the mass of solute added to a known mass of solvent is known, and the change in the colligative property is measured, the molar mass of the solute can be calculated.
To determine the molar mass of a solute using freezing point depression:
It is important to note that colligative properties are only accurate for very dilute solutions, where the solute does not significantly interact with the solvent or other solute particles. In addition, the accuracy of the method can be affected by experimental errors such as impurities in the solvents, measurement errors, and temperature fluctuations.
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