an experiment was set up so that each test tube contained water at a ph of 6.3 and a ph indicator. test tubes 1 and 2 also contained a common pond autotroph. carbon dioxide dissolves in water and forms carbonic acid. after three days the four test tubes were found to have these results.

This experiment is a demonstration of the effects of carbon dioxide on the pH of water. Test tube 1 and 2 contained a common pond autotroph, while test tubes 3 and 4 did not.

By introducing a carbon dioxide source, such as the autotroph, it was possible to observe the effect of an increase in carbon dioxide in the water on the pH of the water.

The results of this experiment show that the presence of the autotroph in test tubes 1 and 2 influenced the pH of the water in those test tubes. Test tubes 1 and 2 both had a pH of 7.1 after three days, while test tubes 3 and 4 had a pH of 6.3. This indicates that the autotroph was able to produce carbon dioxide, which dissolved in the water and caused the pH to rise.

This experiment illustrates the importance of carbon dioxide in the aquatic environment. Carbon dioxide is a major component of the carbon cycle, which is responsible for all the life sustaining processes on Earth. By introducing a carbon dioxide source, such as an autotroph, into the water it is possible to observe the effects of carbon dioxide on the aquatic environment.

Learn more about autotroph at :https://brainly.com/question/11209881

#SPJ4