Phenolphthalein is an indicator for acid-base titration reactions. It changes from colorless to violet-red between pH 8.3-9.8, it is red in extremely acidic solutions, and colorless in extremely alkaline solutions. It is present as a nonionic, lipophilic lactone in aqueous neutral solutions. It exists as a hydrophilic dianion in alkaline solutions. Phenolphthalein has been commonly used as an indicator in the fields of biology and medicine. Synonyms: 3,3-Bis(p-hydroxyphenyl)phthalide, 3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone CAS No: 77-09-8 Molecular Formula: C20H14O4 Molecular Weight: 318.33 Purity: 98-102% (Assay by titration) Appearance: White powder Melting Point: 256-265C Visual Transition Range: From pH 8 (Colorless) to pH 10 (Red) Loss on Drying: 1% Sulfated Ash: 0.1% Alcohol Solution: To pass test Storage and Stability: Maybe stored at RT. Stable for 12 months after receipt.
Molecular Weight:
318.33
CAS Number:
[77-09-8]
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