Bromophenol blue
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Not to be confused with Bromothymol blue.
Bromophenol blue (3′,3″,5′,5″-tetrabromophenolsulfonphthalein, BPB),[2] albutest[3] is used as a pH indicator, an electrophoretic color marker, and a dye. It can be prepared by slowly adding excess bromine to a hot solution of phenolsulfonphthalein in glacial acetic acid.[4]
Quick Facts Names, Identifiers ...
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Preferred IUPAC name
3,3-Bis(3,5-dibromo-4-hydroxyphenyl)-2,1λ6-benzoxathiole-1,1(3H)-dione | |
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3D model (JSmol) |
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ECHA InfoCard | 100.003.715 |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C19H10Br4O5S | |
Molar mass | 669.96 g·mol−1 |
Odor | odorless |
Density | 2.2 g/mL[1] |
Melting point | 273 °C (523 °F; 546 K) |
Boiling point | 279 °C (534 °F; 552 K) |
Acidity (pKa) | 4.0 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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