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Welcome!
Today its time to
do a lab, called the
Dry Lab.
Materials!
*4 Test Tubes
*Bottle of Bromothymol blue
*Water
*Straws
*Snails
*Plants (Elodea)
Step 1:
Fill one clean test tube halfway full of water. Put 23 drops of bromothymol blue. Get the straw and blow bubbles into the test tube. Record Observations.
Step 2:
Fill one clean test tube halfway full of water. Put the same amount of drops as in step one (23) of bromothymol blue. This time, insert a snail into test tube. Record Observation after 5 minutes of snail in tube. Remove snail after observation.
Step 3:
Fill one clean test tube halfway full of water with same amout of bromothymol blue. Insert one plant (elodea) into test tube. Record observations after 5 mintues of plant in tube. Remove plant after observation.
Step 4:
Fill last test tube halfway full of water with same amount of bromothymol blue. This time, insert both one snail and one plant (elodea) into test tube. Record observations after 5 minutes.
RESULTS:
Step 1:
Water starts out blue because of the bromothymol blue and after blowing the bubbles, causes it to turn to a light greenish color. This is causes because carbon dioxide in the water produces carbonic acid.
Step 2:
Water will start to turn a ver lite color, due to the fact that the snail respires repeatedly.
Step 3:
The water will start to turn a blue-greenish color, because the carbon dioxide and the water yield sugar and oxygen when the chlorophyll and sunlight are present.
Step 4:
The water should become a yellowish color, due to the fact that since there is no sunlight, the plant is unable to photosynthesize. Therefore, it is always creating carbon dioxide, along with the snail in there. The water soon becomes acidic because there is so much CO2 and thats what causes the water to turn to a yellow color.
RESULTS:
Step 1:
Water starts out blue because of the bromothymol blue and after blowing the bubbles, causes it to turn to a light greenish color. This is causes because carbon dioxide in the water produces carbonic acid.
Step 2:
Water will start to turn a vert lite color, due to the (snail) that the snail lets off.