Potato Lab

Topics: Water, Potato, Environment Pages: 3 (663 words) Published: November 13, 2012
Michael Castelli Keegan Bauman
Potato Lab
Dr. Peano
Block 1
Potatoes are just your average food; they have been around for as long as the human race can remember. In this lab we will make them be a prime example of osmosis, which is a transport mechanism. In this lab the problem being tested was what environment affects the mass of the potatoes the most. The independent variable is the environments used salt, water and iodine solution. The dependent variable is the mass of the potato after being exposed to the environment for 5 days. The control was a potato in no specific environment, meaning it is just sitting in air, no salt and no water/iodine solution. If the potato is exposed to a specific (hypotonic/hypertonic) environment then the mass will increase/decrease because the cell will grow or shrink due to the environment exposed to. Experimental Design:

The groups being testes are the hypotonic environment (water and iodine), hypertonic environment (Salt) and the control which is just the potato in just the beaker. The time the potatoes stay in each environment is 5 days. One potato is in 300mL of water and iodine solution, another is in 300mL of salt and the last potato is just in air. The potatoes are all fully peeled with no skin. The potatoes are in 3 different beakers with saran wrap over the top of each beaker. Materials:

3 potatoes
Potato peeler
3; 500mL beakers
300mL of salt
300mL water
50 drops of iodine
Saran wrap
Safety goggles
Triple beam balance

1. Gather materials above
2. Put on goggles
3. Be safe
4. Peel three potatoes over garbage
5. Take mass of each potato
6. Record
7. Put three potatoes in three different beakers
8. Leave one potato in just the beaker (control)
9. In another beaker put 300 mL of water in with 50 drops of iodine (hypotonic environment) 10. In last beaker put 30mL of salt ensuring potato is covered. (hypertonic...
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