Question

Is the phenol red indicator used to detect the amount of carbon dioxide or oxygen? Explain.​

Answer 1

Answer:

As the instructor, you supply the carbon source by blowing bubbles in phenol red. The carbon dioxide in your breath will dissolve in water to form carbonic acid, which lowers the pH of the solution. Phenol red turns yellow in a pH lower than 7, revealing in this case the presence of a carbon source.

Explanation:

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