Question

analyze the data and draw conclusions
table 2: diffusion tests
| description | step 4:
test for
diffusion of starch | step 7:
test for
diffusion of glucose |
| color of solution in dialysis tube | initial color: clear
color after 15 minutes: black | not observed |
| color of solution in beaker | initial color: yellow
color after 15 minutes: yellow | initial color: light blue
color after 5 minutes of boiling: red |

was there diffusion?

y / n reason:

y / n reason:

analysis:
diffused though the semipermeable membrane.
done

Explanation:

Step1: Analyze starch diffusion data

The beaker's yellow iodine solution stayed yellow, while the dialysis tube's clear solution turned black (iodine + starch reaction). Starch did not leave the tube, so no starch diffusion out.

Step2: Analyze glucose diffusion data

The beaker's light blue Benedict's solution turned red after boiling, which is a positive result for glucose. Glucose moved out of the tube into the beaker.

Step3: Fill in diffusion conclusions

For starch: $\text{N}$, Beaker solution stayed yellow (no starch entered it). For glucose: $\text{Y}$, Benedict's test turned red (glucose entered beaker).

Step4: Complete the analysis blank

Glucose is the substance that diffused through the membrane.

Answer:

Completed Table Entries:

• Was there diffusion? (Starch): N, Reason: The beaker's iodine solution remained yellow, so starch did not diffuse out of the dialysis tube.
• Was there diffusion? (Glucose): Y, Reason: The Benedict's test on the beaker solution turned red after boiling, confirming glucose diffused out of the tube.

Analysis:

glucose diffused though the semipermeable membrane.