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Lecture 3 DQ Osmosis

Osmosis

Q 1.Solve the following osmosis problems below. I know they are difficult, but it will help a lot if you draw a diagram to visualize these problems. 1.Solve the following osmosis problems below. I know they are difficult, but it will help a lot if you draw a diagram to visualize these problems. a. What is the osmolarity of the cell, and the tonicity of the solution? b. Which direction will water move, and what will happen to cell size? c. If the cell instead is placed in pure water, how will the direction of osmosis change? 2. Using the same parameters at the above problem, assume the 500 mOsM of iodine is added to the solution, which is diffusable. a.How much of this solute only will be in each environment after diffusion? b. What will be the TOTAL osmolarity in each environment? (include non-diffusable solutes). c. What will be the direction of osmosis after all solutes have diffused? 3. What is the correlation between osmotic gradient (difference in solutes between the two sides) and water movement?

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1 a)The osmolarity of the cell is 350 mOsM and the tonicity of the solution is 200mOsm . b . The water will move into the cell as osmosis is the process in which water molecules move towards the area of high concentration so the cell gets increase in size after the movement of water inside the cell. The solution is less concentrated than the cell so it is considered hypotonic which defines that water will enter the cell.