Bromophenol blue

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A tan to orange powder that is used as an acid-base indicator dye. In solution, bromophenol blue gives a yellow color below pH 3.0 and purple color above pH 4.6.

Synonyms and Related Terms

Bromphenolblau (Deut.); bromophenol blue; bromcresol blue; bromphenol blue sulfone form; 3,3',5,5',-tetrabromophenolsulfonphthalein; 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(2,6-dibromophenol)S,S dioxide

Chemical structure

Bromphenol blue.jpg

Other Properties

Soluble in ethanol, ether, ethyl acetate, benzene, alkali solutions. Slightly soluble in water. Hexagonal crystals.

Composition C19H10Br4O5S
CAS 115-39-9
Melting Point 273
Molecular Weight mol. wt. = 670.02
Boiling Point 279 (dec)

Hazards and Safety

Ingestion, inhalation or contact may cause irritation.

Mallinckrodt Baker: MSDS

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1468
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C19H10Br4O5S, CAS= 115-39-9

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