p-Phenolsulfonic Acid
Title: p-Phenolsulfonic Acid
CAS Registry Number: 98-67-9
CAS Name: 4-Hydroxybenzenesulfonic acid
Additional Names: sulfocarbolic acid
Molecular Formula: C6H6O4S
Molecular Weight: 174.17
Percent Composition: C 41.38%, H 3.47%, O 36.74%, S 18.41%
Literature References: Commercially available as a 65% soln. Prepn by hydrolysis of p-chloro- or p-bromobenzenesulfonic acid: Zollinger, Roehling, US 1321271 (1920); by sulfonation of phenol: Davidson, Byrne, GB 820659 (1959 to Hardman & Holden). Prepn of ammonium salt: Oxley et al., J. Chem. Soc. 1948, 303.
Properties: Deliquescent needles. Miscible with water, alcohol.
 
Derivative Type: Ammonium salt
Additional Names: Ammonium p-phenolsulfonate
Molecular Formula: C6H9NO4S
Molecular Weight: 191.20
Percent Composition: C 37.69%, H 4.74%, N 7.33%, O 33.47%, S 16.77%
Properties: Plates from water, dec 270-271°.
 
Derivative Type: Barium salt
Additional Names: Barium p-phenolsulfonate
Molecular Formula: C12H10BaO8S2
Molecular Weight: 483.66
Percent Composition: C 29.80%, H 2.08%, Ba 28.39%, O 26.46%, S 13.26%
Properties: Monohydrate, powder. Poisonous! Sol in water; slightly sol in alcohol.
 
CAUTION: Irritating to skin.
Use: Intermediate in mfg of pharmaceuticals, dyestuffs. In the Ferrostan process of tin plating (U.S. Steel).

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