In Lab1, you made dialysis bags and filled them with starch solution. Let’s imag
ID: 3508226 • Letter: I
Question
In Lab1, you made dialysis bags and filled them with starch solution. Let’s imagine something different now: You pour starch solution into a beaker. You make a bag of dialysis tubing containing iodine solution. You place the bag of iodine solution into the beaker of starch solution. The initial colors of the solutions were recorded in Table 1 below.
Table 1: Solution Color Results
Solution
Initial Color
Final Color
Color of solution in bag
Amber/yellow, clear
Answer: ??
Color of solution in beaker
Cloudy (white)
Answer: ??
Question 1: After 15 minutes, the final color of the solution in the bag and the solution in the beaker will be recorded. Predict the final color of each solution, and record in Table 1.
Question 2: Explain fully why you predict the above colors, based on the evidence of diffusion you observed in Lab 1. (hint: You will have to comment on both starch and iodine.) - in my lab, my final color of iodine in the beaker was amber; and my final color of starch in the bag was blue.
Solution
Initial Color
Final Color
Color of solution in bag
Amber/yellow, clear
Answer: ??
Color of solution in beaker
Cloudy (white)
Answer: ??
Explanation / Answer
Ans:Glucose is leaving the bag slowly; this is shown buy using the glucose tape in the beaker. Iodine is entering the dialysis bag; this is shown by the change of color in the bag. Water enters the bag; the bag becoming fatter, which shows this.
The substances moved and out of the bag, according to the gradient. Some were small substances and moved in and out of the bag quickly and easily. The larger substances, like starch and glucose, were slow or didn’t enter or leave the bag at all.
final colours are indigo and amber.
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