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4 cards from this section. Quick, good the night before a test.
What is the van’t Hoff factor for a solution where the observed colligative property is greater than expected?
Think about whether particles are increasing or decreasing.
Define dissociation in the context of solutions.
Consider how ionic compounds behave in water.
What does a van’t Hoff factor greater than 1 indicate?
Think about how ions behave in solution.
True or False: The van’t Hoff factor can be less than 1.
Consider examples of solutes that might not behave ideally.
A solution of potassiumnitrate (KNO₃) has a van’t Hoff factor of 3 due to its dissociation into K+ and 2NO3-. Calculate the boiling point elevation for 1 m of KNO₃ if K_b = 0.52 °C kg/mol.
Make sure to account for the dissociation factor in the calculation.
Consider a solution of glucose (C₆H₁₂O₆), which has a van’t Hoff factor equal to 1. If this solution has a molality of 2, calculate the freezing point depression. The K_f for water is 1.86 °C kg/mol.
Remember, glucose does not dissociate, so use i = 1.
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