2007-07-27 07:52:31 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
It's easy to search using Google, just as I did:
http://en.wikipedia.org/wiki/Phenolphthalein
2007-07-27 08:11:22 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
Phenolphthalein is a chemical compound with the formula C20H14O4 (often written as "HIn" in shorthand notation). Often used in titrations, it turns colorless in acidic solutions and 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.
Appearance: odourless white to cream powder
Melting point: 260 C
Vapour density: 11 (air = 1)
Density (g cm-3): 1.29...
2007-07-28 12:43:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Phenolphthalein is a chemical compound with the formula C20H14O4 (often written as "HIn" in shorthand notation). Often used in titrations, it turns colorless in acidic solutions and 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.
Systematic name Phenolphthalein
Chemical formula C20H14O4
Molecular mass 318.33 g molâ1
Density 1.299 g cmâ3, solid
Melting point 263-265 °C
Boiling point 258 °C
CAS number [77-09-8]
2007-07-27 15:11:38 · answer #3 · answered by ucenigma 3 · 1⤊ 0⤋
Synonyms: 3,3-bis(p-hydroxyphenyl) phthalide; 3,3-bis(4-hydroxyphenyl)-1(3H)-isobenzofuranore
CAS No.: 77-09-8
Molecular Weight: 318.33
Chemical Formula: C20H14O4
IT causes cancer!
look this site up, i always look everything up in MSDS
Phenolphthalein is a chemical compound with the formula C20H14O4 (often written as "HIn" in shorthand notation). Often used in titrations, it turns colorless in acidic solutions and 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
2007-07-27 15:17:19 · answer #4 · answered by Sam 2 · 0⤊ 0⤋