Question

question
what is the function of phenol red in this experiment?
it is a base.
it is a proton donor.
it is a buffer.
it is a ph indicator.
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Explanation:

Phenol red changes color depending on the pH of the solution it is in, which is the characteristic of a pH - indicator. It is not a base, a proton - donor, or a buffer.

Answer:

It is a pH indicator.