Osmosis Lab

1. Report your individual groups’ data

Groups solute molecule Glucose 10%

tube bag pre-weigh 9.94g

tube bag post-weigh 10.79

Was your solute able to pass through the dialysis membrane? Yes

Did your tube bag gain or lose weight? Gained weight

2. Which molecule (glucose 10%, salt, glucose 30% or starch) caused the tube bag to gain the most weight?

Group 8, Glucose 30%.

3. Compare the conditions, glucose 10% and glucose 30%? Which one caused more of a weight gain/loss in the bag? Explain why.

Glucose 30%, Because water travels to where “there is the most stuff”, in this case, more Glucose.

4. Why were some substances unable to pass through the dialysis membrane?

I am unsure as to how one groups Starch was unable to pass through while the other groups was. But, I would have to say Starch doesn’t pass through the dialysis membrane because it is too large to fit through the pores of the dialysis tubing.

5. Why did the tube bags gain OR lose weight? Your explanations should discuss osmosis and/or diffusion.

Explanation for tube bags gaining weight : The reason the tube bag gained weight is because within the tube bag there is a higher concentration of water then outside the bag therefore, through osmosis, the water went from a region of low concentration to a region of High water concentration until the osmotic pressure became even with the hydrostatic pressure.

Explanation for tube bags losing weight : All Bags gained weight according to the data provided.

6. Osmosis. Read pages 70-72 of your Marieb textbook and then explain in your own words the abnormal shapes of the red blood cells in figures b and c of figure 3.9 (figure included below). What kind of solutions have those cells been placed in and what has happened as a result?

Figure B has been placed in a hypertonic solution, and as result the red blood cell shrinks by losing water due to osmosis. There is a higher concentration outside of the cell then inside...