By: Rebecca Richmond

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Mega Solutes!

• By Rebecca Richmond
• and Louisa Meng

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Procedure

• To make 4 solution take 4g of solute and
  dissolve into 50 ml of water than slowly add 50
  more ml of water.

• Put 5ml diameter potato slice in the cups.

• Leave for 30 min

• Be sure to measure weight before and after.

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Purpose and hypothesis

• The purpose of this experiment was to test how
  different solutes effected osmosis rates in
  potatoes.
• If it is in deed true, water should move from the
  potato into the solution. In other words from
  hypotonic to hypertonic solutions. In the
  distilled water solution water should move into
  the potato.

Hypo
Hyper
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Data
Solution in 100ml Beginning weight of Potato Ending weight mass
1. Distilled Water 3.9 g 4.2 7.14
2. 4 Salt 3.9 g 3.7 -5.4
3. 4 Glucose 4.0 g 4.2 4.76
4. 4 Sucrose 3.9 g 4.0 2.5
Controls- Potato size, 100ml of solution, triple
beam balance, percent of solute, 30
min Variables- Solute
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Conclusion

• Most of our data matches the rules of osmosis.
  The water inside the potato moved into the
  solution in the salt water meaning more salt was
  present outside so it flowed out to create an
  equilibrium. In both the sucrose and glucose the
  potato gained weight which might have happened
  because there was more sugar in the potato. In
  the distilled water the potato gained weight
  because it contained less water.

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• To improve our results to see more drastic
  changes we could leave the potato in the
  solutions longer.
• Since our measuring was done by hand that could
  have lead to incorrect solutions. Also the
  changes in eight were small, so it could have
  been because of excess water of materials n the
  potato before we weighed it
• Some of the glucose could have moved into the
  potato as well because of facilitated diffusion.
• Salt and Sucrose cannot move into the potato.