Nume comun Fenolftaleină
Numar CAS 77-09-8
Densitatea fenolftaleinei 1,4±0,1 g/cm3
Fenolftaleină Punct de fierbere 557,8±50,0 °C la 760 mmHg
Punctul de topire al fenolftaleinei 258-263 °C
Fenolftaleină Formula moleculară C20H14O4
Greutatea moleculară a fenolftaleinei 318.323
Fenolftaleină Punct de aprindere 206,5±23,6 °C
Masa exactă a fenolftaleinei 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 |
SPECIFICAȚIE |
REZULTATE |
| Caracteristici |
A white or almost white powder, practically insoluble in water, soluble in alcohol. |
O pulbere albă, practically insoluble in water, soluble in alcohol. |
| Punct de topire |
It melts at about 260°C. |
261ºC.~262ºC. |
| Identificare |
A: Pozitiv
B: Pozitiv |
A: Pozitiv
B: Pozitiv |
| Aspectul soluției |
The solution is clear and not more intensely colored than reference solution Y7 |
Se conformează |
| Substante inrudite |
Less than 0.5% |
<0.5% |
| Metale grele |
Not more than0.001% |
<0.001% |
| Acidity or alkalinity |
Se conformează |
Se conformează |
| Chlorides |
Nu mai mult ca 0.01% |
<0.01% |
| Sulfates |
Nu mai mult ca 0.02% |
<0.02% |
| Pierdere prin uscare |
Nu mai mult ca 0.5% |
0.12% |
| Sulfated ash |
Nu mai mult ca 0.1% |
0.01% |
| Test |
98.0%-101.0%(C20H14O4) |
99.6% |
| CONCLUSION: Conform With EP6/BP2009 |
