Para-toluenesulfonic acid

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Colorless, hygroscopic crystals used as an extender in soaps.

Chemical structure

Para-toluenesulfonic acid.jpg

Synonyms and Related Terms

p-toluenesulfonate; p-toluenesulfonic acid, monohydrate; p-tolylsulfonic acid; p-TSA; tosic acid; 4-methylbenzenesulfonic acid; p-methylphenylsulfonic acid;


  • Combustible. Flash point = 184 C.
  • Corrosive.
  • Contact causes irritation and burns.
  • Parchem: SDS

Physical and Chemical Properties

Soluble in ethanol, ether, water.

Composition C6H4(SO3H)(CH3)
CAS 104-15-4
Melting Point 107 C
Density 1.24 g/ml
Molecular Weight mol. wt. = 172.2
Boiling Point 140 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990

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