2007-11-08 11:28:38 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Its conjugate bases are stabilized through delocalization of the negative charges between the phenolic and carbonyl oxygens. The canonical forms with two charges, both on carbonyl oxygens, have conjugation lengths of 7 and 9 double bonds, respectively, depending on the canonical form of the connecting ring. That is what accounts for the deep coloration of the basic solution.
Oops, I had the structure a little bit off, so even though what I said was qualitatively right, for the most part, it wasn't completely or quantitatively accurate. My bad! That's what happens when you get a Ph.D. in organic chemistry and then program computers for 25+ years!
2007-11-08 11:39:40 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Hi. Here are some. http://www.answers.com/main/ntquery?s=phenolphthalein&gwp=13
2007-11-08 11:36:19 · answer #2 · answered by Cirric 7 · 0⤊ 0⤋
It has a really interesting name, it watches a lot of T.V. (especially The Price Is Right,) and it's lactose intolerant.
2007-11-08 11:34:50 · answer #3 · answered by Anonymous · 0⤊ 1⤋
It is used as a laxative as well as acid-base indicator. It turns dark pink at high pH.
2007-11-08 11:34:05 · answer #4 · answered by Anonymous · 0⤊ 0⤋
It changes color in a narrow pH range, thus is used in colorimetric chemistry.
2007-11-08 11:31:24 · answer #5 · answered by Sophia 3 · 0⤊ 0⤋