| Description | Phenolphthalein (Phthalin) is an acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic. |
| Synonyms | Euchessina, Phthalimetten, 酚酞, Phthalin |
| molecular weight | 318.32 |
| Molecular formula | C20H14O4 |
| CAS | 77-09-8 |
| Storage | keep away from direct sunlight | Powder: -20°C for 3 years | In solvent: -80°C for 1 year | Shipping with blue ice. |
| Solubility | DMSO: 60 mg/mL (188.49 mM), Sonication and heating are recommended. |
| References | 1. Uesawa Y, et al. Arch Toxicol. 2007 Mar;81(3):163-8. |