Multiple Choice
What is the freezing point in °C of a solution prepared by dissolving 6.80 g of MgCl2 in 110 g of water? The value of Kf for water is 1.86 (°C·kg)/mol, and the van't Hoff factor for MgCl2 is i = 2.7.
14. Solutions
Freezing Point Depression
Back14. Solutions
Freezing Point Depression
- Multiple ChoiceWhich of the following aqueous solutions has the lowest freezing point?
- Multiple ChoiceWhich of the following aqueous solutions will have the highest freezing point?
- Multiple ChoiceA solution was prepared by dissolving 2.500 g of a non-dissociating solute in 125 g of pure water. The resulting solution has a freezing point of -0.190°C. The Kf of water is 1.86°C/m. What is the molar mass of the unknown solute?
- Multiple ChoiceWhat is the freezing point of a solution made by dissolving 59.5 g of CaCl2 into 100 g of H2O, given that the van't Hoff factor (i) for CaCl2 is 3 and the freezing point depression constant (Kf) for water is 1.86 °C/m?
- Open Question
Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 ml of benzene (d = 0.877 g/ml). pure benzene has a melting point of 5.50 °C and a freezing point depression constant of 4.90 °C/m.
- Multiple ChoiceWhen the pressure surrounding a pure substance increases, what typically happens to its freezing point?
- Multiple ChoiceWhich of the following best describes the freezing point of pure water at standard atmospheric pressure?
- Multiple ChoiceWhich of the following aqueous solutions is expected to have the lowest freezing point?
- Multiple ChoiceWhich of the following solutes, when dissolved in 1 kg of water, will lower the freezing point to -3.72 b0C? (Assume complete dissociation and use K_f = 1.86 b0C kg/mol for water.)
- Multiple ChoiceWhich of the following aqueous solutions has the lowest freezing point?
- Multiple ChoiceWhich of the following aqueous solutions will have the lowest freezing point?
- Multiple ChoiceWhich of the following best represents the freezing point of fluorine (F_2) under standard atmospheric pressure?
- Multiple ChoiceWhich of the following best describes the effect of adding a nonvolatile solute to pure fluorine on its freezing point?
- Multiple ChoiceWhich of the following best describes what happens when water freezes?