Procedure:
1. Put 100mL of water into the beaker and add 20 drops of BTB.
2. Add in the Aquarium snail.
3. Repeat steps 1 and 2.
4. Put one of these test tubes in the light and the other one in complete dark. Let them both sit for an hour.
5. Put 100mL of water into another beaker an add 20 drops of BTB.
6. Add an Elodea Plant.
7. Repeat steps 5 and 6.
8. Put one beaker in the light the other in the dark and leave both for an hour.
9. Put 100 mL of water into a different beaker and add 20 drops of BTB.
10. Add in an aquarium snail and an Elodea plant.
11. Repeat steps 9 and 10
12. Place one of the beakers in the light and the other in the dark. Let them both stay here for one hour.
2.
1. Water plus bromothymol blue is blue-green.
Brothymol blue is a blue-green liquid which changes to a yellow color in acid and back to blue-green when returned to a neutral pH.
2. Water plus bromothymol blue plus an aquarium snail turns yellow.
All animals respire and Carbon dioxide in water produces carbonic acid. BTB changes colors when its pH isn't neutral anymore.
3. Water plus bromothymol blue plus elodea, an aquarium plant, is blue-green in light.
Well green plants photosynthesize in light and respire all the time. Then carbon dioxide plus water yields sugar and oxygen when chlorophyll and sunlight are present. Finally BTB is blue-green is when the pH is neural.
4. Water plus BTB plus a snail plus elodea is a blue-green in light and yellow when left in the dark for three hours.
Well first of all all animals respire and plants photosynthesize in sunlight. When you take the sunlight out the plant quits taking up the carbon dioxide. This then produces carbonic acid which changes the water to a yellow color because BTB isn't at a neural pH anymore.
3.
1. How much BTB was used in each different experiment?
2. What type of aquarium snail was used?
3. What color would it change if there were more snails then plants?
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