Monday, September 19, 2011
AP Bio blog 6 due mon 9/26 8:00 am
A dialysis bag containing 0.01 M sucrose solution and 0.04M glucose solution is submerged in a container containing 0.02M glucose solution and iodine in the form of IKI. What do you expect to happen if you allow the bag to react with its environment for 1 hour? Explain the logic you used to answer the question.
Subscribe to:
Post Comments (Atom)
i would expect either the glucose to move out of the bag,or if the bag is selectively permeable, by not letting glucose pass through, the water would rush in to balance out the solution. the same should be expected with the sucrose. this occurs because there is more sucrose and glucose in the bag than outside of it. the iodine would seep through with the water, into the bag causing the solution inside the bag to change color
ReplyDeleteI would expect the glucose to diffuse to the outside to balance out the solution of glucose outside the bag. In addition because sucrose is a larger molecule it will not be able to diffuse out of the bag therefore with osmosis water will rush into the bag to balance out that solution. The IKI will diffuse into the bag to balance out the solution with the outside of the bag. Moreover the contents in the bag would change color from the clear solution to a dark-blue or even purple since IKI changes color in a solution of glucose and sucrose. This all occurs passively.
ReplyDeleteI would expect the glucose and sucrose to diffuse out of the bag and the IKI and water to go into the bag in order to create equilibrium. This occurs because the concentration of sucrose and glucose inside the bag is greater than that outside the bag, and the concentration of IKI and water is greater outside the bag than inside, also causing the bag to become a dark blue color because of the concentration of sucrose, IKI, and gluscose This occurs because of diffusion, which is the spontaneous movement of a substance down its concentration gradient, from a region where it is more concentrated to a region where it is less concentrated.
ReplyDeleteThe glucose would diffuse outside the bag to balance the solution of glucose outside the bag. Sucrose would not be able to diffuse outside the bag because it is a larger molecule than glucose and is a disaccharide. The osmosis of water will balance this in and out of the bag.The IKI will diffuse into the bag and create a darker color within the bag (like the diffusion lab we did last year). The bag will also gain mass because of the IKI solution and become heavier. All this diffusion is done with passive transport, without the use of energy.
ReplyDeleteSucrose molecules must be transported across the membrane via active transport because of their size. Because this could not freely occur, water and IKI would diffuse into the membrane, down their concentration gradient. They would react with the contents of the bag, changing the color.
ReplyDeleteSucrose molecules would be moved across the semi permeable membrane (if it is), and then water will enter into the bag so it can balance the 0.4 Glucose solution. Also the IKI would begin to diffuse through osmosis and reach equilibrium which would change the color of the fluid/liquid in the bag. Also a difference in weight will occur due to the movement of various molecules.
ReplyDeletedepending on the permeability of the bag, i would suspect that the glucose would diffuse into the outer solution and sucrose might diffuse out for both molecules to be equal on each side. if the bag was to tight for any molecule to fit through, then osmosis would occur where the IKI would undergo osmosis from the outside of the bag to balance out both sides. since the iodine went into the bag, it would react with the sucrose thus changing the color to a dark iodine, which proves that the IKI underwent osmosis. :^)
ReplyDeleteSince most dialysis bags are permeable to monosaccharide sugars like glucose, I would expect for 0.01M of glucose solution in the bag to passively diffuse to the environment to create equilibrium. Because Sucrose is much larger than glucose, it can't permeate through the dialysis bag. So, in order to balance the higher concentration of sucrose, osmosis occurs and water as well as IKI enters the dialysis bag to create favorably isotonic conditions.
ReplyDelete