for chemistry class
2007-02-04 13:13:52 · 5 answers · asked by ammbannock72 1 in Science & Mathematics ➔ Chemistry
Phenolphthalein is a sensitive chemical with the formula C20H14O4 (often written as "HIn" in shorthand notation). Often used in titrations, it turns from colorless in acidic solutions to pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In solutions containing a pH below 0, phenolphthalein turns a bright orange color.
In strongly basic solutions, phenolphthalein's pink color undergoes a rather slow fading reaction and becomes colorless again. In other words, the molecule has four forms:
2007-02-04 13:17:09 · answer #1 · answered by nra_man58 3 · 0⤊ 0⤋
It is an indicator used to show the change from acidic to basic, it turns from clear, colorless to pink
2007-02-04 21:22:18 · answer #2 · answered by alex p 2 · 0⤊ 0⤋
It is a compound that identifies if a substance is is acid or alkaline by changing color in the presence of either. Pink for acid, blue for alkaline.
2007-02-04 21:18:12 · answer #3 · answered by opinionator 5 · 0⤊ 0⤋
it was used for laxatives but was found to be a carcinogen also is used to detect blood stains during investigations
2007-02-04 21:28:01 · answer #4 · answered by evon stark 5 · 0⤊ 0⤋
your answer lies here .. this site
http://en.wikipedia.org/wiki/Phenolphthalein
2007-02-04 21:19:48 · answer #5 · answered by The old man 6 · 0⤊ 0⤋