Загальна назва фенолфталеїн
Номер CAS 77-09-8
Фенолфталеїн Густина 1,4±0,1 г/см3
Фенолфталеїн Температура кипіння 557,8±50,0 °C при 760 мм рт.ст
Температура плавлення фенолфталеїну 258-263 °C
Молекулярна формула фенолфталеїну C20H14O4
Молекулярна маса фенолфталеїну 318.323
Температура спалаху фенолфталеїну 206,5±23,6 °C
Точна маса фенолфталеїну 318.089203
Phenolphthalein is a chemical compound with the formula C20Х14О4 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 |
СПЕЦИФІКАЦІЯ |
RESULTS |
| Characteristics |
A white or almost white powder, practically insoluble in water, soluble in alcohol. |
A white powder, practically insoluble in water, soluble in alcohol. |
| Точка плавлення |
It melts at about 260°C. |
261ºC.~262ºC. |
| Ідентифікація |
А: Positive
Б: Positive |
А: Positive
Б: Positive |
| Appearance of solution |
The solution is clear and not more intensely colored than reference solution Y7 |
Відповідає |
| Споріднені речовини |
Less than 0.5% |
<0.5% |
| Важкі метали |
Not more than0.001% |
<0.001% |
| Acidity or alkalinity |
Відповідає |
Відповідає |
| Chlorides |
Not more than 0.01% |
<0.01% |
| Sulfates |
Not more than 0.02% |
<0.02% |
| Втрати при висиханні |
Not more than 0.5% |
0.12% |
| Sulfated ash |
Not more than 0.1% |
0.01% |
| аналіз |
98.0%-101.0%(C20H14O4) |
99.6% |
| CONCLUSION: Conform With EP6/BP2009 |
