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Overview
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.
Chemical Properties
| Molecular Formula | C20H14O4 |
| Molecular Weight | 318.32 |
| CAS Numbers | 77-09-8 |
| Solubility | DMSO |
| Purity | 98% by HPLC |
| SMILES Code | OC1=CC=C(C=C1)C1(OC(=O)C2=C1C=CC=C2)C1=CC=C(O)C=C1 |
Storage and Handling
0C Short Term, -20C Long Term
References
Uesawa Y, et al. Arch Toxicol. 2007 Mar;81[3] 163-8.