Home Categories Biochemical Engineering Bromine thymol blue indicator
A2216112

Bromine thymol blue indicator , 0.02%(w/v)inwater , 76-59-5

Synonym(s):
3′,3′′-Dibromothymolsulfonphthalein, BTB;3′,3″-Dibromothymolsulfonphthalein;3,3`-Dibromethylmolsulfonphthalein;Bromothymol Blue

CAS NO.:76-59-5

Empirical Formula: C27H28Br2O5S

Molecular Weight: 624.38

MDL number: MFCD00005872

EINECS: 200-971-2

Pack Size Price Stock Quantity
100ml RMB47.20 In Stock
500ML RMB183.20 In Stock
others     Enquire
Update time: 2022-07-08

PRODUCT Properties

Melting point: 200-202 °C (lit.)
Density  1.4668 (estimate)
Flash point: 38 °C
storage temp.  Store at +5°C to +30°C.
solubility  Solubility Sparingly soluble in water, benzene; soluble in ethanol, ether; insoluble in petroleum ether
Boiling point: 614.3±55.0 °C(Predicted)
form  Solid
pka 7.0, 7.1(at 25℃)
color  Pink-brown to purple
PH Range 6(yellow)-7.6(blue)
Odor Characteristic odour
PH pH : 6.0~7.6
Water Solubility  slightly soluble
λmax 420nm, 435nm, 620nm
Merck  14,1445
BRN  373934
Stability: Stable. Incompatible with strong oxidizing agents.
Major Application Sol-gel matrix, fuel cells, optical sensors, combustion gas detection system, paints, toys, cleaning products, detergents, textiles, food freshness sensor, identifying fresh and stale rice,wheat, detecting microorganisms, bacterial growth, psychoactive drug, dental materials
LogP 8.600 (est)

Description and Uses

Bromothymol blue is a pH indicator for weak acids and bases. In neutral solution, it appears bluish-green. At pH above 7.6 it appears blue, and at pH below 6.0 it appears yellow.
Bromothymol blue (BTB) is an anionic dye. It can be protonated or deprotonated to generate yellow or blue. BTB helps to make ion-pair complex, that is used to identify several pharmaceutical compounds with the help of extractive spectrophotometric methods.

Bromothymol blue is mostly used in measuring substances that would have relatively low acidic or basic levels (near a neutral pH). It's often used in pools, fish tanks, or measuring the presence of carbonic acid in a liquid.
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.

Safety

Symbol(GHS) 
GHS02,GHS07,GHS08
Signal word  Danger
Hazard statements  H226-H319-H335+H336-H340-H360-H372-H373
Precautionary statements  P201-P202-P210-P233-P240-P241+P242+P243-P260-P264-P270-P271-P280-P303+P361+P353-P304+P340+P312-P305+P351+P338+P337+P313-P308+P313-P403+P233-P405-P501
Hazard Codes  Xn
Risk Statements  10-41-36/37/38-20/21/22
Safety Statements  24/25-39-26-36
RIDADR  1170
WGK Germany  3
RTECS  SJ450000
TSCA  Yes
HazardClass  3
PackingGroup  III
HS Code  29349990

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