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BTB

Synonym(s):3′,3′′-dibromothymolsulfonephthalein sodium salt;3,3`-Dibromothylmolsulfonphthalein Sodium Salt;Bromothymol blue sodium salt;Bromothymol Blue, Sodium Salt;Bromthymol Blue sodium salt

  • CAS NO.:34722-90-2
  • Empirical Formula: C27H29Br2NaO5S
  • Molecular Weight: 648.38
  • MDL number: MFCD00077263
  • EINECS: 252-169-7
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-07-29 18:03:56
BTB Structural

What is BTB?

Chemical properties

Dark greenish gold crystalline powder

The Uses of BTB

It is employed as a pH indicator which is yellow at pH ? 6.0 and blue at pH ? 7.6. It finds its major application in lithium battery, textiles and antagonists.

The Uses of BTB

Suitable for use:

  • In preparations of pH indicator solutions
  • In phospholipid staining on tissues and cells prepared on microscopy slides

The Uses of BTB

Bromothymol Blue sodium salt has been used as a pH indicator in the yeast growth media (YPD, yeast extract peptone dextrose).

What are the applications of Application

Bromothymol blue sodium salt is a pH indicator which is yellow at pH ≤ 6.0 and blue at pH ≥ 7.6

General Description

Bromothymol Blue is a sulfonated hydroxyquinone in acidic solutions. In alkaline solutions, it is present as a dianion that is blue with a larger conjugated system than the yellow hydroxyquinone. Both forms are lipophilic. It is also known as bromthymol blue or dibromothymolsulfonphthalein.

Biochem/physiol Actions

Bromothymol Blue is a pH-indicator. It is also used for carbonic anhydrase assay due to the conversion of carbon dioxide to bicarbonate.

Properties of BTB

Melting point: 200-202°C
Density  0.990
storage temp.  room temp
solubility  Solubility Soluble in water, ethanol
form  Powder
pka 7.0, 7.1(at 25℃)
color  Orange-brown to dark green
Odor Characteristic odour
PH Range Yellow (6.0) to blue (7.6)
Water Solubility  SOLUBLE
λmax 615nm, 392nm
BRN  6887926
Stability: Stable. Incompatible with strong oxidizing agents.
Major Application Lithium battery, textiles, antagonists
CAS DataBase Reference 34722-90-2(CAS DataBase Reference)
EPA Substance Registry System Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[2-bromo-3-methyl-6-(1-methylethyl)-, monosodium salt (34722-90-2)

Safety information for BTB

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P271:Use only outdoors or in a well-ventilated area.
P280:Wear protective gloves/protective clothing/eye protection/face protection.

Computed Descriptors for BTB

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