(A 4.) A student sets up an experiment where she places a dialysis bag full of i
ID: 205093 • Letter: #
Question
(A 4.) A student sets up an experiment where she places a dialysis bag full of iodine and water, into a beaker filled with 1% starch. She observes that the dialysis bag gets significantly smaller and remains a orangish brown color and the solution in the beaker also turns a dark purple blue. a. In the experiment described above, (1) did starch move into the dialysis back and (2) how can you tell what is the experimental evidence.? (1.5 pts) b. In the experiment described above did water move between the dialysis bag and the beaker? How can you tell- what evidence do you have from the experiment? (1.5 pts) 5.) You make lemonade this summer using the crystal light powder and water. Which is the solvent, which is the solute? (1 pt)Explanation / Answer
4.
Dialysis tubing only allows the movement of smaller solvent molecules. It supports the osmotic movement of solvent molecules from high water potential to the low water potential. Iodine turns starch into blue-colored substance.
In the given experiment, water and iodine are placed in a dialysis tubing and suspended in a 1% starch solution. Since the starch solution is hypertonic, water and iodine move out of the dialysis bad leading to the shrinkage of the bag. Since iodine comes out of the bag and enters the starch solution, the solution turns blue.
The starch did not move into the dialysis bag. This can be explained by the lack of blue color formation inside the dialysis bag and shrinkage of the dialysis bag.
If the starch were to move into the dialysis bag, the bag would have bulged and turned blue.
5.
Solvent = The component in greater proportion = Water
Solute = The component in lesser proportion. = Crystal light powder
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