The dye phenol red turns yellow in the presence of acid products and is included in fermentation broth for some diagnostic tests.
Phenol is an ordinary pH indicator and at a lower pH value i.e >7, Phenol red is a colorless compound.
The compound exhibits a sudden change in color as a result of a higher ph value.
It is composed of both negatively charged and positive charged particles i.e sulfate and ketone groups.
When it reacts with an acid the pH of phenol solution ranges between 6-8 and shows a quick transition from red to yellow indicating a pH change.
The transition from red to yellow is due to the loss of proton by the ketone group.
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