Description
Synonyms: Bromothymol blue, 3′,3′′-Dibromothymolsulfonphthalein, BTB
Empirical Formula (Hill Notation): C27H28Br2O5S
DESCRIPTION
Bromophenol blue Indicator is recommended as a pH indicator, a colour marker and as a dye. Bromphenol blue is an acid-base indicator structurally related to phenolphthalein (a popular indicator). It changes colour from yellow at pH 3.0 to blue at pH 4.6; this reaction is reversible.
Analysis Note
Transition range: pH 5.8 – pH 7.6yellow – blue
Appearance of solution: passes test
Loss on drying (110 °C): ≤ 3
Transition range (according to ACS): passes test
Sensitivity test: passes test
Appearance of solution: passes test
Loss on drying (110 °C): ≤ 3
Transition range (according to ACS): passes test
Sensitivity test: passes test
PROPERTIES
grade
ACS reagent
Pack Size
5g; 25g
Agency
reag. Ph. Eur.
form
solid
loss
≤3% loss on drying, 110°C
visual transition interval
5.8-7.6, yellow to blue
bulk density
450 kg/m3
storage temp.
2-30°C
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