Phenolphthalein Sodium
Title: Phenolphthalein Sodium
CAS Registry Number: 518-51-4
CAS Name: 3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone disodium salt
Molecular Formula: C20H12Na2O4
Molecular Weight: 362.29
Percent Composition: C 66.30%, H 3.34%, Na 12.69%, O 17.66%
Literature References: Prepd from an alcoholic soln of 1 mol phenolphthalein by the addition of 2 mols NaOH. Structure: Buu-Hoi, Bull. Soc. Chim. [5] 8, 165 (1941).
Properties: Reddish-brown granular mass with coppery luster, or pale red powder. Dec in air. Soluble in water, giving a deep-red soln. Absorption max: 550-555 nm. The unstable enol form is colorless, as is the trisodium salt.
Absorption maximum: Absorption max: 550-555 nm
Status: This monograph has been retired and is no longer subject to revision or update.

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