2.8 - Abnormal Molar Mass and van’t Hoff Factor (i)
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Practice Questions
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What is the van’t Hoff factor for a solution where the observed colligative property is greater than expected?
💡 Hint: Think about whether particles are increasing or decreasing.
Define dissociation in the context of solutions.
💡 Hint: Consider how ionic compounds behave in water.
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Interactive Quizzes
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What does a van’t Hoff factor greater than 1 indicate?
💡 Hint: Think about how ions behave in solution.
True or False: The van’t Hoff factor can be less than 1.
💡 Hint: Consider examples of solutes that might not behave ideally.
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Challenge Problems
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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.
💡 Hint: 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.
💡 Hint: Remember, glucose does not dissociate, so use i = 1.
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