J.R. S. answered 06/10/20
Tutor
5.0
(145)
Ph.D. University Professor with 10+ years Tutoring Experience
You could easily Google "phenolphthalein" and get the answer. But here it is...
It is a chemical compound with the formula C20H14O4 and is used as an acid-base indicator. It is colorless in acid and turns pink in base.