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The Affects of pH on the Rate of Osmosis

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Jessie Gendreau

on 22 December 2014

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Transcript of The Affects of pH on the Rate of Osmosis

Intro/Background
What is pH
?
pH is the measurement of the hydrogen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH, and solutions with a low concentration of H+ ions have a high pH. The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Each whole pH value below 7 is ten times more acidic than the next higher value.
The Affects of pH on the Rate of Osmosis
Materials
1. 6 soaked water dialysis bags
2. 3 red solo cups
3. 100 mL of .1 molar HCl solution
4. 100 mL of .1 molar NaOH solution
5. 100 mL of water
6. 18 pipetfuls of sugar solution
7. balance
8. Timer
9. Safety equipment (gloves, goggles.... A LOT OF PAPER TOWELS!!!)
Safety
Procedure
1) Fill 3 Dialysis bags with 4 pipet fulls of sugar solution
2) Blot the bags dry and determine intial mass.
3) Place one in a cup of H2O, another in .1m HCl, and the final one in NaOH
(1m)(X)=(.1m NaOH)
4)Before placing the bags in the cups, take the pH of each one.
5) Record the mass of the bags every 2 minutes for 10 minutes.

Data
Investigation by...
Jessie Gendreau and Lucinda Duggan
Graph
Conclusion
Intro/Background Continued...
What is osmosis?
a process in which a higher concentration of water molecules transports to a lower concentration of water molecules across a semi permeable membrane in order to make both sides equal. When both sides are equal in concentration, then osmosis is finished, and equilibrium has been reached.

https://docs.google.com/a/tyngsboroughps.org/document/d/16_woHYHsG7oyPOSOucZFp5jchikO5OzLS6btmcKAZBo/edit

In conclusion, the purpose of this lab was to answer the question of whether or not the rate of diffusion is affected by the pH of the substance being diffused. A trend in the data seems to be that all substances have gone up in mass by 2 grams by the end of the lab. Some error sources are when drying off the bags squeezing too hard could have caused some liquid to come out. Also broken equipment cause some mistakes, and lastly cross contamination could make one substance diffuse faster messing up the data. Our hypothesis can not be accepted. this is because they all diffused around the same rate. The hypothesis stated that a lower pH would diffuse faster because of the many single hydrogen molecules instead of the ones with a high pH that would have more complex molecules. this in because the hydrogen molecules are smaller then the more complex ones meaning they could fit easier through the membrane increasing the rate at which it diffuses.
Focus on #s 1, 8, 9, 11-17, 23, 27-29, 31-34, 36, and 39 on Flinn Scientific's Student Safety Contract
Watch this video to learn more about osmosis!
What is NaOH?
NaOH is the chemical formula for sodium hydroxide. The chemical substance is also known as caustic soda or lye. In its pure state, sodium hydroxide is white in color and is commonly found in the form of pellets, granules, or flakes. Sodium hydroxide is also highly soluble in water and has a high alkaline level which makes it very delicate to handle.
What is HCl?
HCl is the chemical formula for Hydrochloric Acid. It is a clear, colorless, highly pungent solution of Hydrogen Chloride (gas) in water. It is a highly corrosive, strong mineral acid with many industrial uses.
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