Question
Two snails and two Elodea sprigs are placed together in a tube containing a bromothymol blue solution. The tubes are put into a dark closet. After 24 hours, what will the color of the water be in tube A?
Answers
GPT-4o mini
Bromothymol blue is a pH indicator that changes color based on the acidity or alkalinity of a solution. In the presence of carbon dioxide (CO2), the solution becomes more acidic, turning yellow. Conversely, when the solution is alkaline, it turns blue.
In this experiment, you have two snails and two sprigs of Elodea in a tube with bromothymol blue. The snails will respire, consuming oxygen and producing CO2, which will lower the pH of the solution. Meanwhile, the Elodea can photosynthesize when light is available, consuming CO2 and releasing oxygen. However, since the tubes are placed in a dark closet, the Elodea will not be able to perform photosynthesis; instead, it will also respire, contributing to the production of CO2.
After 24 hours in the dark, both the snails and the Elodea will have contributed to increasing the concentration of CO2 in the water, leading to an increase in acidity. As a result, the bromothymol blue solution is expected to turn yellow due to the lower pH caused by the accumulation of CO2.
Therefore, after 24 hours in the dark, the color of the water in tube A will be **yellow**.
In this experiment, you have two snails and two sprigs of Elodea in a tube with bromothymol blue. The snails will respire, consuming oxygen and producing CO2, which will lower the pH of the solution. Meanwhile, the Elodea can photosynthesize when light is available, consuming CO2 and releasing oxygen. However, since the tubes are placed in a dark closet, the Elodea will not be able to perform photosynthesis; instead, it will also respire, contributing to the production of CO2.
After 24 hours in the dark, both the snails and the Elodea will have contributed to increasing the concentration of CO2 in the water, leading to an increase in acidity. As a result, the bromothymol blue solution is expected to turn yellow due to the lower pH caused by the accumulation of CO2.
Therefore, after 24 hours in the dark, the color of the water in tube A will be **yellow**.