Общее название фенолфталеин
Количество CAS 77-09-8
Фенолфталеин Плотность 1,4±0,1 г/см3
Температура кипения фенолфталеина 557,8±50,0 °С при 760 мм рт.ст.
Температура плавления фенолфталеина 258-263 °С
Молекулярная формула фенолфталеина C20H14O4
Молекулярный вес фенолфталеина 318.323
Фенолфталеин Температура вспышки 206,5±23,6 °С
Фенолфталеин Точная масса 318.089203
Phenolphthalein is a chemical compound with the formula C20ЧАС14О4 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.
| ТЕСТОВЫЙ ПУНКТ |
ТЕХНИЧЕСКИЕ ХАРАКТЕРИСТИКИ |
ПОЛУЧЕННЫЕ РЕЗУЛЬТАТЫ |
| Характеристики |
A white or almost white powder, практически нерастворим в воде, soluble in alcohol. |
A white powder, практически нерастворим в воде, soluble in alcohol. |
| Температура плавления |
It melts at about 260°C. |
261ºC.~262ºC. |
| Удостоверение личности |
А: Положительный
Б: Положительный |
А: Положительный
Б: Положительный |
| Внешний вид раствора |
The solution is clear and not more intensely colored than reference solution Y7 |
Соответствует |
| Связанные вещества |
Less than 0.5% |
<0.5% |
| Тяжелые металлы |
Not more than0.001% |
<0.001% |
| Acidity or alkalinity |
Соответствует |
Соответствует |
| Chlorides |
Не более чем 0.01% |
<0.01% |
| Sulfates |
Не более чем 0.02% |
<0.02% |
| Убыток от высыхания |
Не более чем 0.5% |
0.12% |
| Sulfated ash |
Не более чем 0.1% |
0.01% |
| анализ |
98.0%-101.0%(C20H14O4) |
99.6% |
| CONCLUSION: Conform With EP6/BP2009 |
