Cell Membranes and Transport
Hands-On Labs, Inc. Version 42-0033-00-01

Exercise 1: Diffusion

Observations

Data Table 1: Rate of diffusion in different temperatures | | ºC | Minutes | Temperature | InitialTemp. | InitialColor | 5 | 10 | 15 | 20 | 25 | 30 | 60 | Cold | 10°celsius | clear | clear | clear | clear | clear | clear | light purple | light purple | Ambient | 25°celsius | clear | clear | clear | clear | light purple | light purple | med purple | med purple | Hot | 75°celsius | clear | purple | purple | purple | purple | dark purple | dark purple | dark purple |

Questions

A. Write a one-paragraph …show more content…

What is the reasoning behind the use of egg whites? How does this part of the experiment relate to membranes?

- The reasoning for using egg whites in this lab is to show that when certain solutions mix, the outcome does not necessarily flow. In this particular experiment, a possible error included putting more drops of egg white than it was called for. Because the viscosity of egg white is so thick, a drop resulted in a continuous flow. The excess caused the solution to solidify among each other. Egg whites relate to the membrane because it showed that it had a semi permeable membrane.

B. What do the results of test tube e tell about the effect of isopropyl alcohol on egg whites?

- The result of test tube e, showed me that effect of isopropyl alcohol on egg whites caused a physical reaction. This is so because it formed a precipitate.

C. What do the results of test tube f tell about the effect of isopropyl alcohol on oil? How does this relate to membranes?

- The results in test tube f proved to me that just like oil water do not mix, neither do isopropyl alcohol and oil mix. The two solutions are not soluble components when placed with each other and therefore maintain their own form.

D. Based on the results