4. A solution is prepared by combining 15.00 g of ethylene glycol with 135.00 g water....
4. A solution is prepared by combining 15.00 g of
ethylene glycol with 135.00 g water. These liquids are “miscible”
in each other (what does this mean?) The van’t Hoff factor for
ethylene glycol is 1.0 What is the effect on the following
properties of the solution compared to the pure solvent, water?
Boiling point higher, lower, the same Freezing point higher, lower,
the same Vapor pressure higher, lower, the same
5. Tree sap can be a very concentrated solution of solutes in
water. These are mostly sugars, with van’t Hoff factors of 1. The
root system provides a semi-permeable membrane across which water
movs to “dilute” the sap, providing a significant osmotic pressure.
If a tree sap has an effective concentration of 37 Molar, what
pressure is generate at 298K across the endodermis root membrane? R
= 0.08216 L.atm/mol.K. If an osmotic pressure of 1.0 atm can raise
a colume of water 10.33 meters high, how high can the sap of this
tree rise?
Homework Answers
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4. A solution is prepared by combining 15.00 g of
ethylene glycol with 135.00 g water....
A solution of ethylene glycol in water at 20.0°C has a mass percent of 8.25% of...
A solution of ethylene glycol in water at 20.0°C has a mass percent of 8.25% of ethylene glycol with a density of 1.0087 g/mL. The freezing point depression constant for water (which you can assume is the solvent for all solutions) is K1.86°C kg/mol and the boiling point elevation constant is Kb the following: 0.512°C kg/mol. The density of neat water at 20.0°C is 0.9982 g/ml. Answer 1. What is the molarity of the solution? 2. What is the molality...
A solution of ethylene glycol in water at 20 degrees celsius has a mass percent of...
A solution of ethylene glycol in water at 20 degrees celsius has a mass percent of 9.78% of ethylene glycol with a density of 1.0108 g/mL. The freezing point depression constant for water (solvent for all solutions) is Kf=-1.86 percent celsius kg/mol and the boiling point elevation constant is Kb=0.512 degrees celsius kg/mol. The density of neat water at 20.0 degrees celsius is 0.9982 g/mL. Answer the following: 1. What is the molarity of the solution? 2. What is the...
A solution is prepared by dissolving 7.8 g of ethylene glycol (HOCH2CH2OH) in 50.0 g of...
A solution is prepared by dissolving 7.8 g of ethylene glycol (HOCH2CH2OH) in 50.0 g of water to produce 56.9 mL of solution. Ethylene glycol is non-volatile. a. What is the vapor pressure of the solution at 100oC? b. What is the boiling point of the solution? Kb = 0.51 oC/m
[References] What volume of ethylene glycol (C2HO2), a nonelectrolyte, must be added to 12.0 L water...
[References] What volume of ethylene glycol (C2HO2), a nonelectrolyte, must be added to 12.0 L water to produce an antifreeze solution with a freezing point of-19.0°C? (The density of ethylene glycol is 1.11 g/cm°, and the density of water is 1.00 g/cm³. K, for water is 0.51°C•kg/mol and Kf is 1.86°C kg/mol.) Volume %3D What is the boiling point of this solution? Boiling point °C %3D 5 item attempts remaining Submit Answer Try Another Version [References] Consider an aqueous solution...
1. 1200 mL aqueous solution of 45 g of ethylene glycol and 80 g of sucrose...
1. 1200 mL aqueous solution of 45 g of ethylene glycol and 80 g of sucrose were prepared with a density of 1.37 g/mL. Assume that the solution behaves ideally. Notes: The vapor pressures of water and ethylene glycol at 20 °C are 17.54 torr and 0.06 torr, respectively, and Kb and Kf of water are 0.51 K/m and 1.86 K/m, at 25 °C respectively. a. What is the freezing point of this solution? b. What is the vapor pressure,...
A saline solution contains 7.6 g of NaCl in 1.00 kg of water. Assuming an ideal...
A saline solution contains 7.6 g of NaCl in 1.00 kg of water. Assuming an ideal value for the Van't Hoff factor, i, calculate the freezing point of this solution in °C out of Answer 18 A saline solution contains 79 g of NaCi per 0.60 iter of solution. Assuming an ideal value for the van't Hoff factor, calculate the osmotic pressure (in atm) of this solution at 288 K out of Answer 19 A reverse osmosis unit is used...
6. Under what conditions is water actively transported across a membrane? A. Only from high osmotic...
6. Under what conditions is water actively transported across a membrane? A. Only from high osmotic pressure to low osmotic pressure B. Only from low osmotic pressure to high osmotic pressure C. Only mammals have evolved the capacity for active transport of water in the kidney D. Many vertebrates have aquaporins that can actively transport water E. None - water always moves by passive transport 7. You are studying two animals from the central Atlantic Ocean, a cnidarian and a...
A solution of ethylene glycol in water at 20.0°C has a mass percent of 8.25% of ethylene glycol with a density of 1.0087 g/mL. The freezing point depression constant for water (which you can assume is the solvent for all solutions) is K1.86°C kg/mol and the boiling point elevation constant is Kb the following: 0.512°C kg/mol. The density of neat water at 20.0°C is 0.9982 g/ml. Answer 1. What is the molarity of the solution? 2. What is the molality...
[References] What volume of ethylene glycol (C2HO2), a nonelectrolyte, must be added to 12.0 L water to produce an antifreeze solution with a freezing point of-19.0°C? (The density of ethylene glycol is 1.11 g/cm°, and the density of water is 1.00 g/cm³. K, for water is 0.51°C•kg/mol and Kf is 1.86°C kg/mol.) Volume %3D What is the boiling point of this solution? Boiling point °C %3D 5 item attempts remaining Submit Answer Try Another Version [References] Consider an aqueous solution...
1. 1200 mL aqueous solution of 45 g of ethylene glycol and 80 g of sucrose were prepared with a density of 1.37 g/mL. Assume that the solution behaves ideally. Notes: The vapor pressures of water and ethylene glycol at 20 °C are 17.54 torr and 0.06 torr, respectively, and Kb and Kf of water are 0.51 K/m and 1.86 K/m, at 25 °C respectively. a. What is the freezing point of this solution? b. What is the vapor pressure,...
A saline solution contains 7.6 g of NaCl in 1.00 kg of water. Assuming an ideal value for the Van't Hoff factor, i, calculate the freezing point of this solution in °C out of Answer 18 A saline solution contains 79 g of NaCi per 0.60 iter of solution. Assuming an ideal value for the van't Hoff factor, calculate the osmotic pressure (in atm) of this solution at 288 K out of Answer 19 A reverse osmosis unit is used...
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