Bromothymol blue , PH indicator , 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 |
| 25G | RMB159.20 | In Stock |
|
| 100G | RMB399.20 | In Stock |
|
| others | Enquire |
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 |
