Identify the indicator that has two endpoints.
A) phenol red
B) thymol blue
C) crystal violet
D) phenolphthalein
E) alizarin yellow R

Name: Identify the indicator that has two endpoints. A) phenol red B) thymol blue C) crystal violet D) phenolphthalein E) alizarin yellow R
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Question

Quizplus · Accepted Answer

Thymol blue has two endpoints, meaning it can change color twice. It transitions from red to yellow at a pH of 1.2 to 2.8, and then from yellow to blue at a pH of 8.0 to 9.6. The other indicators listed only have one endpoint.

Identify the Indicator That Has Two Endpoints