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Bromophenol blue (3′,3″,5′,5″-tetrabromophenolsulfonphthalein, BPB), albutest is used as a pH indicator, an electrophoretic color marker, and a dye. It can be prepared by slowly adding excess br omine to a hot solution of phenolsulfonphthalein in glacial acetic acid.
Acid-base indicator
| Bromophenol blue (pH indicator) | ||
| below pH 3.5 | above pH 4.6 | |
| 3.5 | ⇌ | 4.6 |
As an acid-base indicator, its useful range lies between pH 3.0 and 4.6. It changes from yellow at pH 3.0 to blue at pH 4.6; this reaction is reversible. Bromophenol blue is structurally related to phenolphthalein (a popular indicator).
GB/T 12592-90
(AR)
Appearance Tan to Orange Powder
Infrared spectrum Conforms to structure
Claroty of solution Pass
Visual transition interval pH3.0(yellow)- pH4.6(blue)
ltem
(Ind)
pHVisnal transition interval 3.0()~4.6()
Mass absorptivity,L/cm·g ≥115
Solubility in ethanol
()Ignition residue,% ≤0.25
ACS
(ACS Grade)
Appearance
Infrared spectrometry
Claroty of solution
Visual transition interval pH3.0()- pH4.6()
