How temperature affects osmosis
This presentation is the property of its rightful owner.
Sponsored Links
1 / 17

How Temperature Affects Osmosis PowerPoint PPT Presentation


  • 93 Views
  • Uploaded on
  • Presentation posted in: General

How Temperature Affects Osmosis. By: Irfan Nadiadi Sarah Mugharbil Rhiannon Kemp Michael Reese. Hypothesis. The rate of Osmosis depends on the Kinetic Energy of the particles being diffused.

Download Presentation

How Temperature Affects Osmosis

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


How temperature affects osmosis

How Temperature AffectsOsmosis

By: IrfanNadiadi

Sarah Mugharbil

Rhiannon Kemp

Michael Reese


Hypothesis

Hypothesis

  • The rate of Osmosis depends on the Kinetic Energy of the particles being diffused.

  • Because energy is directly related to heat, temperature governs the amount of kinetic energy the particles have.

  • As temperature increases or decreases, the rate of Osmosis should also increase or decrease, causing the potato cores to lose mass faster or slower


Procedure

Procedure

Step 1:

Determine what environments the experiment will take place in. We were restricted to only using four environments at -62.2° C (freezing), -15.5° C (cold), 20.9° C (room temp.), and 95.5° C (boiling).


Procedure1

Procedure

Step 2:

Mix 5% Salt Solutions and add a consistent amount to each beaker. Then cut, weigh, and record four potato cores. We then added 25ml of Salt solution to each beaker.


Procedure2

Procedure

Step 4:

Record the temperature of each environment you are testing in and keep the solution (without the potato cores) in the environment for 5 minutes. This ensures the temperature will not be changing from room temperature when you add the potatoes.


Procedure3

Procedure

Step 5:

Add the potato cores to the salt solutions, checking and recording the mass of the cores at consistent time intervals. Once adding our cores, we checked the mass every 10 minutes for 50 minutes.


How temperature affects osmosis

Data


Analysis

Analysis

When we plotted the data points and fit equations to the graph, we found the equations were sinusoidal because the potato cores continued to lose and gain water over time.

Equations:-62.2° C:

-15.5° C:

20.9° C:


Analysis1

Analysis


Analysis2

Analysis

The sine functions on the previous slide are a good example of how temperature affects osmosis.

The period for the function for room temperature

(20.9° C) is much shorter than that of the function for freezing (-62.2° C). This represents the rate of Osmosis because over time the potato cores will continue to gain and lose water


Observations

Observations

As hypothesized, the average rate of Osmosis decreased significantly when put in freezing conditions; water was absorbed and released slowly and in small quantities.

When the temperature was higher, water was absorbed and released much faster and in higher quantities.

This can be described by how temperature is affecting the kinetic energy of the water molecules in the potato.


Observations1

Observations

In warmer temperatures, the higher kinetic energy causes water particles in the potato to move faster.

Due to the second law of thermodynamics, these particles will tend to diffuse from high to low concentration, thus trying to dilute the salt concentration in the solution outside.


Observations2

Observations

Although we found the rate of Osmosis to increase as temperature increases, when we put the potato cores in boiling water, the kinetic energy was so high that the water had reached its molar heat of vaporization, and quickly evaporated before the particles could completely diffuse.

The high temperatures also damaged the Aquaporin’s in the potato cell membranes, stopping the regulation of the flow of water.

For these reasons, we didn’t include the boiling water environment in our experiment/


Conclusion

Conclusion

  • The purpose of this lab was to see how temperature would affect the rate of osmosis.

  • The results of this lab were that for the freezer we had a average change of 0.092(g) for every 10 min, for the fridge we had 0.158(g), for the room temp. We had 0.412(g), and for boiling we had 0.065(g).


Conclusion1

Conclusion

  • The experiment had a few potential errors. For the boiling environment, although the aquaporin’s were damaged, most of the water evaporated, leaving less water to diffuse. This affected our data significantly so we decided to omit the information for the boiling environment.

  • Another issue that may have affected the mass measurements was how the potato skins were peeling in the water. Our mass measurements may have been lower than what they could have been.


Conclusion changes

Conclusion: Changes

  • If we were to do this experiment again, it would be better to test the hypothesis in multiple environments such that information wouldn’t have to be extrapolated to make a prediction, but rather have a test subject in a range of different temperatures to provide accurate results.


Conclusion what we learned

Conclusion: What we learned

  • We learned for this lab that temperature does affect the rate of osmosis. It is hard to have a specific picture of how much it affects it with this lab but based on the results we have gathered we can tell it does affect it. What we saw with boiling was that it gains mass instead of losing it. The temperature that the rate was fastest was in fact room temperature at a change of ____%. This relates to how cell maintain homeostasis within our body.


  • Login