Osmosis and diffusion PDF

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Summary

This is for lab 4 on osmosis and diffusion. The egg lab was for online students!...

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Osmosis and Diffusion Part 1 (Dialysis bag)

This graph shows the progression of average absorbance of the solution with the dialysis bag over a span of twelve minutes. The line shows the relationships between the points.

Relationship between Concentration of Glucose and percent change in mass over time. This bar graph shows average mass change % for the weight of the dialysis bag. Each bag for control and experimental groups were weighted before and after to see how much fluid diffused. The error bars shows the standard deviation of each bag’s mass group. The experimental group had a greater mass change because the measured weight after was less than the initial mass.

Potato Scatterplot

This graph depicts the decrease of sucrose concentration as the percent change decreases. The trendline shows the relationship between the two points.

Potato Bar graph

This bar graph illustrates the decrease in average percent change as the concentration of sucrose increased.

Egg experiment pictures. Water

Before Size: 5cm After

Size: 5cm and 3 in What happened: Didn’t have much of a difference in size and stayed the same.

Vinegar

Before Size: 5cm After

Size: 5cm and 10 in What happened: It sunk to the bottom off the cup and increase in size.

Maple syrup

Before Size: 5cm After

Size: 5cm and 8 in What happened: The Egg changed to brown ,increased in size and sunk to the bottom of the cup.

Discussion The lab had 2 parts: The first part was the dialysis bag and measuring osmosis. The control group contained a dialysis bag filled with dyed water and the experimented group contained logo’s in it. Both of those dialysis bags were placed in separate beakers full of water and starch solution. Data was collected every 2 minutes, until twelve minutes has passed. The data collected for the class somewhat suggests that as the time increased, so did the absorbance rate. However, for my group data there may have been too much starch because the absorbance rate stayed consistently high. Figure 1 supports this and also shows that experimental average absorbance increased faster than the control group and also had a higher maximum value. The control group faced diffusion, but not as much as the experimental group. This means that only some of the contents in the bag diffused into the solution. This was also supported by the percent change in mass of the bag, which was -9.458%. The experimental group, faced more of a drastic percent change in mass with 5.519% percent. This proved that absorbance change along with data shown in Table 1. Thus, the false hypothesis that the solute within the bag does not affect absorbance. The second part was finding whether sucrose concentrations affected the mass of the potatoes. To do that, potato cylinders were put in each different sucrose concentrations for an hour. This totaled 28 cylinders in 7 beakers. Each cylinder was weighed before and after being waited in sucrose concentration. After conducting the experiment, the unknown value had a -11% change in mass. During this experiment the potatoes decreased in mass. This can be explained through “osmosis by definition means a gradual, often unconscious process of absorption.” (Deshmukh) This means water molecules left the potatoes and osmosis supports this theory.

Literature Cited: Deshmukh, S. (2017). Scientific osmosis. Journal of the international Clinical Dental Research Organization. 9(2) doi:http://dx.doi.org.ezproxylocal.library.nova.edu/10.4103/jicdro.jicdr o_30_17

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