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A yellow crystalline material used in the manufacture of sulfur dyes and photographic developer. Dinitrophenol is a chromotropic pH indicator that is colorless below pH 2.6 and yellow above pH 4.4. It is also used as a wood preservative, an Insecticide, and a reagent for the detection of Potassium and ammonium ions.

Chemical structure


Synonyms and Related Terms

2,4-dinitrophenol; alpha-dinitrophenol; dinitrophenol (Fr.); Aldifen


  • Combustible. Explosion hazard when dry.
  • Highly toxic by skin absorption, ingestion and inhalation.
  • Millipore Sigma: SDS

Physical and Chemical Properties

Soluble in ethanol, ether, benzene and chloroform. Slightly soluble in water.

Composition C6H3OH(NO2)2
CAS 51-28-5
Melting Point 112-114 C
Density 1.683 g/ml
Molecular Weight mol. wt.=184.11

Resources and Citations

  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

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