In an investigation of osmosis, apple cores were submerged in different molarity solutions to determine the unknown osmolarity of the apple. To determine the molarity five uniform apple cores were massed before submerging them in different molarity solutions. After 24 hours the apple cores were massed again. Then the percent change in mass was determined for the five uniform apple cores in each molarity solution.

Describe the similarities and differences between the dialysis bag and a cell membrane. Be specific. If you want water to flow out of a dialysis bag filled with a 50 percent sucrose solution what would be the minimum concentration of the beaker solution need to be?

When the potato cube is surrounded by a hypotonic solution what change in mass occurs in the potato cells?

Cells are placed in a beaker of water. The concentration of glucose outside of the cells is 3 mg/ml. The concentration of glucose inside of the cells is 33 mg/ml. Assuming glucose is the only solute, in which direction will osmosis occur? *

A 28-year-old woman who is in the final stages of running a marathon on a hot day has regularly consumed Water along the path. She begins to have a severe headache and shows symptoms of being confused. She has been sweating profusely, losing elec- trolytes and, to compensate, has been drinking pure water. Explain the osmotic nature of what is happening in relationship to the movement of water in her blood and brain cells and what should be done to correct the problem.