Which colligative property lowers in proportion to the molality of the solute? osmotic pressure freezing point boiling point vapor pressure
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Step 1: Colligative properties are properties of solutions that depend on the concentration of solute particles, but not on the identity of the solute. Show more…
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A colligative property is a physical property of a solution that depends only on the number (concentration) of solute particles present in a given quantity of solvent and not on their chemical identities. Colligative properties include: - Vapor-pressure lowering - Boiling-point elevation - Freezing-point depression - Osmotic pressure Compared with the pure solvent, a solution will have a lower vapor pressure, higher boiling point, lower freezing point, and higher osmotic pressure. For questions asking about the vapor pressure/boiling point/freezing point/osmotic pressure of solutions, they are the same question! You will look at the number of particles in the solutions (osmolarities): whichever has the highest osmolarity, that solution will have the strongest colligative property. Here is the question: Arrange the following three solutions in increasing order of their vapor pressures (solution with the lowest vapor pressure first). (A) 0.200 M KCl (B) 0.100 M NH4Cl (C) 0.200 M CaCl2
Shaiju T.
Among the colligative properties of solution, which one is the best method for the determination of molecular masses of proteins and polymers? (a) osmotic pressure (b) lowering in vapour pressure (c) lowering in freezing point (d) elevation in boiling point
Adi S.
When a nonvolatile solute is added to a volatile solvent, the solution's vapor pressure, boiling point, freezing point, and osmotic pressure across a semipermeable membrane decrease, increase, decrease, and increase respectively. The colligative property is defined as the property that depends on the number of solute particles present in the solution. The solute particles lower the solvent's vapor pressure, thus requiring a higher temperature to cause boiling. The solute particles do not raise the solvent's vapor pressure. The solute does not increase the volume of the solution, and an increase in volume does not require an increase in temperature to reach the boiling point (derived from PV = nRT). The freezing point depression, boiling point elevation, and osmotic pressure are colligative properties. The solubility is not a colligative property. Therefore, the correct answer is "solubility" as it is not a colligative property.
Susan H.
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