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Properties of Solutions

Properties of Solutions. Ch. 17. Properties of Solutions – ch. 17. 1. Is O 2 more soluble in water or carbon tetrachloride?. Properties of Solutions – ch. 17. 2. Is CH 3 OH or CH 3 CH 2 CH 2 CH 2 CH 2 OH more soluble in water? . Properties of Solutions – ch. 17.

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Properties of Solutions

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  1. Properties of Solutions Ch. 17

  2. Properties of Solutions – ch. 17 1. Is O2 more soluble in water or carbon tetrachloride?

  3. Properties of Solutions – ch. 17 2. Is CH3OH or CH3CH2CH2CH2CH2OH more soluble in water?

  4. Properties of Solutions – ch. 17 3. How does temperature and/or pressure typically affect the solubility of solids verses gases?

  5. Properties of Solutions – ch. 17 4. If the solubility of CO in water is 0.08 M at 25 °C and 0.75 atm, what is the solubility of CO in water at 25 °C and 2.6 atm?

  6. Properties of Solutions – ch. 17 4. If the solubility of CO in water is 0.08 M at 25 °C and 0.75 atm, what is the solubility of CO in water at 25 °C and 2.6 atm?

  7. Properties of Solutions – ch. 17 5. The term proof is defined as twice the percent by volume of ethanol (CH3CH2OH) in solution. Thus, a solution that is 95% ethanol by volume is 190 proof. What is the molarity, molality and mole fraction of ethanol in a 92 proof ethanol/water solution? The density of pure ethanol is 0.8 g/mL.

  8. Properties of Solutions – ch. 17 5. The term proof is defined as twice the percent by volume of ethanol (CH3CH2OH) in solution. Thus, a solution that is 95% ethanol by volume is 190 proof. What is the molarity, molality and mole fraction of ethanol in a 92 proof ethanol/water solution? The density of pure ethanol is 0.8 g/mL. Concentrations Molarity => M = nsolute/Lsolution Molality => m = nsolute/kgsolvent Mole fraction => Xa = na/ntotal

  9. Properties of Solutions – ch. 17 6. Calculate the heat of hydration for the following ionic solids. a. KF b. RbF

  10. Properties of Solutions – ch. 17 7. Rank the following aqueous solutions by their boiling points, freezing points, vapor pressure and osmotic pressure. a. 0.1 M C6H12O6 b. 0.1 M KBr c. 0.05 M Na2SO4 d. 0.05 M CH3COOH

  11. Properties of Solutions – ch. 17 8. Calculate the boiling point and freezing point of a solution made by dissolving 110 g of K3PO4 in 800 mL of water. For water Kb = 0.51 °Ckg/mol and Kf = 1.86 °Ckg/mol.

  12. Properties of Solutions – ch. 17 9. Calculate the vapor pressure of a solution made by dissolving 159 g of in 500 g of water at 27 °C. At 27 °C the vapor pressure of pure water is 26.74 torr.

  13. Properties of Solutions – ch. 17 10. Toluene and benzene form an ideal solution. What is the vapor pressure of a solution prepared by mixing 60 g of toluene with 15 g of benzene at 25 °C? At 25 °C the vapor pressures of pure toluene and pure benzene are 28 and 95 torr respectively. benzene toluene

  14. Properties of Solutions – ch. 17 11. Pentane and hexane form an ideal solution. What composition of a pentane and hexane solution at 25 °C would give a vapor pressure of 350 torr? At 25 °C the vapor pressures of pure pentane and hexane are 511 torr and 150 torr respectively.

  15. Properties of Solutions – ch. 17 12. Draw a vapor pressure curve for the following solutions at 25 °C. a. Propanol (VP = 74 torr) and methanol (VP = 271 torr), heat of solution is 0 kJ b. Propanol and water (VP = 23.7 torr), solution feels cooler upon mixing c. Methanol and water, solution feels warmer upon mixing

  16. Properties of Solutions – ch. 17 13. Calculate the osmotic pressure of a solution made by dissolving 83 g of glucose (C6H12O6) in 100 mL of water at 30 °C.

  17. Properties of Solutions – ch. 17 14. A solution contains 3.75 g of a nonvolatile hydrocarbon in 95 g of acetone. The boiling points of pure acetone and the solution are 55.9 °C and 56.5 °C respectively. What is the molar mass of the hydrocarbon? For acetone the Kb = 1.71 °CKg/mol.

  18. Properties of Solutions – ch. 17 15. A solution that contains 29.4 g of non-volatile/non-ionizing solute in 100.8 g of water has a vapor pressure of 25.81 torr at 27 °C. What is the molar mass of the solute? The vapor pressure of water at 27 °C is 26.74 torr.

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