1)
Materials: 5 beakers, water, bromothymol blue, 3 snails, 3 Elodea (aquarium plant), a lighted area, a dark area
Do these tests on a lab bench at room temperature. Use 100 ml. of water and 50 drops of bromothymol blue per beaker.
2. Get a beaker of water and add bromothymol blue to it. Then add an aquarium snail to it and observe what color it is after 3 hours.
3. Get a beaker of water and add bromothymol blue to it. Then add Elodea, once you have done this place it under light and observe what color it is after 3 hours.
4. Get 2 beakers with water and add bromothymol blue to each of them. Then place an aquarium snail and Elodea in each of them. Once you are done with this place one in the light and one in the dark. Leave them there for 3 hours then observe the colors.
2)
1. Water plus bromothymol blue is blue-green because the oxygen in the water turns the bromothymol blue a blue-green color.
2. Water plus bromothymol blue plus an aquarium snail turns yellow because animals respire in the form of carbon dioxide, which in water makes carbonic acid. This turns the solution yellow.
3. Water plus bromothymol blue plus elodea is blue-green in light because green plants photsynthesize in the light and respire all the time.
4. a) Water plus bromothymol blue plus a snail plus elodea is blue-green in light because because the plant does photosynthesis.
b) Water plus bromothymol blue plus a snail plus elodea is yellow in the dark because the plant has no light for photosynthesis.
3)
1. It doesn't give adequate information on where the acid comes from to make the solution yellow.
2. They did not try all of the experiments in the dark. If it was in the dark there would be more accurate data.
3. What type of snail do you use that will stay in the water.
2. Water plus bromothymol blue plus an aquarium snail turns yellow because animals respire in the form of carbon dioxide, which in water makes carbonic acid. This turns the solution yellow.
3. Water plus bromothymol blue plus elodea is blue-green in light because green plants photsynthesize in the light and respire all the time.
4. a) Water plus bromothymol blue plus a snail plus elodea is blue-green in light because because the plant does photosynthesis.
b) Water plus bromothymol blue plus a snail plus elodea is yellow in the dark because the plant has no light for photosynthesis.
3)
1. It doesn't give adequate information on where the acid comes from to make the solution yellow.
2. They did not try all of the experiments in the dark. If it was in the dark there would be more accurate data.
3. What type of snail do you use that will stay in the water.
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