1. The 1 M solution of sucrose was made by taking 1 mole of sucrose (342 g) and adding enough water to make 1 L of the solution (approximately 800 mL of water as needed). Using what you have learned about osmosis, provide an explanation for your observations (be sure to include “free water concentration” to justify your answer).
2. Water can move between the blood and the brain by osmosis, but salts cannot. An athlete ran a marathon and lost a great deal of salt from the blood through sweat. At the end of the race, the athlete drank a lot of pure water, which quickly entered the bloodstream. he athlete then got a terrible headache. What do you think caused the headache, and how was osmosis involved?
3. Here is a statement often made about osmosis: Osmosis is the movement of solvent molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration until the solute concentrations of both regions are equal.
a. If the above statement were correct, which way would water move if you had 1 M glucose on one side of the membrane and 0.5 M glucose on the other side?
b. If the statement were correct, which way would water move if you had 1 M glucose on one side of the membrane and 1 M sucrose on the other side?
