Question

A chemical indicator called phenol red is typically used in microbiology labs. at ph 8, it appears fuchsia; at neutral, it appears red; and at ph 6, it is yellow. if this indicator were incorporated into a medium with a sugar and turned from red to yellow after bacteria grew on the medium for 24 hours, what could you conclude?

Answer 1

Th bacteria have somehow affected the pH levels. They made the indicator turn yellow, a sign of low pH, or greater acidity.