Nome comune Fenolftaleina
Numero CAS 77-09-8
Fenolftaleina Densità 1,4±0,1 g/cm3
Fenolftaleina Punto di ebollizione 557,8±50,0 °C a 760 mmHg
Punto di fusione della fenolftaleina 258-263 °C
Formula molecolare della fenolftaleina C20H14O4
Peso molecolare della fenolftaleina 318.323
Fenolftaleina Punto di infiammabilità 206,5±23,6 °C
Massa esatta della fenolftaleina 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 |
SPECIFICA |
RISULTATI |
| Caratteristiche |
A white or almost white powder, practically insoluble in water, solubile in alcool. |
A white powder, practically insoluble in water, solubile in alcool. |
| Punto di fusione |
It melts at about 260°C. |
261ºC.~262ºC. |
| Identificazione |
UN: Positivo
B: Positivo |
UN: Positivo
B: Positivo |
| Appearance of solution |
The solution is clear and not more intensely colored than reference solution Y7 |
Conforme |
| Related substances |
Meno di 0.5% |
<0.5% |
| Metalli pesanti |
Not more than0.001% |
<0.001% |
| Acidity or alkalinity |
Conforme |
Conforme |
| Chlorides |
Non più di 0.01% |
<0.01% |
| Sulfates |
Non più di 0.02% |
<0.02% |
| Perdita all'essiccamento |
Non più di 0.5% |
0.12% |
| Cenere solfatata |
Non più di 0.1% |
0.01% |
| Saggio |
98.0%-101.0%(C20H14O4) |
99.6% |
| CONCLUSION: Conform With EP6/BP2009 |
