Photosynthesis Lab

Materials:
-3 beakers
-bromothymol blue (BTB)
-aquarium snail
-elodea (aquarium plant)

Procedure:
1. Acquire 3 50-ml beakers
2. Fill to 40-ml with tap water
3. Place ten drops of BTB to each beaker
4. Place the aquatic plant into one beaker
5. Place the elodea into another beaker
6. After three hours record and observe the color of all three beakers.
7. Now place the beaker with elodea in a dark area and observe the color of water after an hour or so
8. when finished with the experiment place the plant and snail in the appropriate place and clean up your work area.

Observations:
1. Water and BTB only is blue-green, this is a neutral pH of 7.
2. If the BTB plus snail is a yellow color then that shows that the snail is resperating and the CO2 changed the pH.
3.With the plant and BTB one should notice two different things happening, depending on the conditions.