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Osmotic pressure measurements are less accurate and difficult to carry out. Therefore, this method is not useful for measuring molecular weights. But it is used to find out the molecular weights of polymers, e.g., plastics, proteins, and starch having many monomer units. Knowing the value of the osmotic pressure of a given solution, the molecular weight of the solute can be calculated using van't Hoff equation. |
A solution which shows deviation from Roult's law is called: |
Ideal solution Real Solution Saturated solution Uniform solution |
Real Solution |
A solution which shows deviation from Roult's law is called a non-ideal solution. So the answer is 2. Real Solution. Roult's law states that the vapor pressure of a solution is equal to the sum of the vapor pressures of the individual components of the solution, each multiplied by its mole fraction. A non-ideal solution is one that does not obey Roult's law. This can happen because the intermolecular forces between the solute and solvent molecules are different from the intermolecular forces between the solute and solute molecules or the solvent and solvent molecules. Here are some examples of non-ideal solutions:
These solutions all have vapor pressures that are either higher or lower than what would be predicted by Roult's law. |
