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Bromocresol purple

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Bromocresol purple
Names
IUPAC name 4,4'-(1,1-Dioxido-3H-2,1-benzoxathiole-3,3-diyl)- bis(2-bromo-6-methylphenol)
Other names 5',5''-Dibromo-o-cresolsulfonephthalein
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.003.716 Edit this at Wikidata
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C21H16Br2O5S/c1-11-7-13(9-16(22)19(11)24)21(14-8-12(2)20(25)17(23)10-14)15-5-3-4-6-18(15)29(26,27)28-21/h3-10,24-25H,1-2H3Key: ABIUHPWEYMSGSR-UHFFFAOYSA-N
  • InChI=1/C21H16Br2O5S/c1-11-7-13(9-16(22)19(11)24)21(14-8-12(2)20(25)17(23)10-14)15-5-3-4-6-18(15)29(26,27)28-21/h3-10,24-25H,1-2H3Key: ABIUHPWEYMSGSR-UHFFFAOYAH
SMILES
  • Brc1c(O)c(cc(c1)C3(OS(=O)(=O)c2ccccc23)c4cc(c(O)c(Br)c4)C)C
Properties
Chemical formula C21H16Br2O5S
Molar mass 540.22 g·mol
Appearance Purple powder
Melting point 241 - 242 °C (decomposition)
Solubility in water < 0.1 %
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1 0 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Bromocresol Purple (BCP) or 5',5"-dibromo-o-cresolsulfophthalein, is a pH indicator. The most common solution is 0.04% aqueous.

Bromocresol Purple (pH indicator)
below pH 5.2 above pH 6.8
5.2 ⇌ 6.8

Uses

Besides its primary function as an indicator, Bromocresol Purple is used in medical laboratories to measure albumin, and as an addition to acid stop baths used in photographic processing as an indicator that the bath has reached neutral pH and needs to be replaced.

References

Template:InChI

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