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2 cards from this section. Quick, good the night before a test.
What does the van’t Hoff factor represent?
Think about how many ions or particles are created when a salt dissolves.
What is a colligative property?
It’s related to how salts affect boiling and freezing points.
What is the van’t Hoff factor for NaCl in solution?
It's the sum of the ions in solution.
True or False: The van’t Hoff factor is greater than 1 for solutes that associate.
Consider what happens when particles group together.
A non-volatile solute creates a depression in freezing point of 3 K. If the van’t Hoff factor is measured as 1.5, determine the molar mass of the solute given K_f for water is 1.86 K kg/mol.
First calculate m, then rearrange to find molar mass.
Consider a solution where the van’t Hoff factor of a solute is 3. If the osmotic pressure is observed to be 2.5 atm at 298 K, calculate the molality of the solution.
First isolate n/V, then use the relation to find molality.
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