Vanligt namn fenolftalein
CAS-nummer 77-09-8
Fenolftalein Densitet 1,4±0,1 g/cm3
Fenolftalein Kokpunkt 557,8±50,0 °C vid 760 mmHg
Smältpunkt för fenolftalein 258-263 °C
Fenolftalein Molekylformel C20H14O4
Fenolftalein Molekylvikt 318.323
Fenolftalein Flampunkt 206,5±23,6 °C
Fenolftalein Exakt massa 318.089203
Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments. It is a weak acid, which can lose H+ ions in solution. The nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further loss of proton in higher pH occurs slowly and leads to a colorless form. Phenolphthalein ion in concentrated sulfuric acid is orange red due to sulfonation.
Phenolphthalein is one of the most widely used indicators. Phenolphthalein is used as a laxative to treat incomplete and infrequent bowel movement.Phenolphthalein also is used in automotive and aviation industries.
| TEST ITEM |
SPECIFIKATION |
RESULTAT |
| Characteristics |
A white or almost white powder, practically insoluble in water, soluble in alcohol. |
A white powder, practically insoluble in water, soluble in alcohol. |
| Smältpunkt |
It melts at about 260°C. |
261ºC.~262ºC. |
| Identifiering |
A: Positiv
B: Positiv |
A: Positiv
B: Positiv |
| Lösningens utseende |
The solution is clear and not more intensely colored than reference solution Y7 |
Följer |
| Relaterade substanser |
Less than 0.5% |
<0.5% |
| Tungmetaller |
Not more than0.001% |
<0.001% |
| Acidity or alkalinity |
Följer |
Följer |
| Chlorides |
Not more than 0.01% |
<0.01% |
| Sulfates |
Not more than 0.02% |
<0.02% |
| Förlust vid torkning |
Not more than 0.5% |
0.12% |
| Sulfated ash |
Not more than 0.1% |
0.01% |
| Analysera |
98.0%-101.0%(C20H14O4) |
99.6% |
| CONCLUSION: Conform With EP6/BP2009 |
