IND
76-61-9
C27h30o5s
200-973-3
Organic Analytical Reagents
Indicator
For Biological Purpose, For Scintillation
Standard
Laboratory Reagents, Analytical Reagents
Concrete
Thymol Blue 76-61-9 pH Indicator
Scientific Research
Organic Reagent
466.59
221–224 °c
Insoluble
Brownish-Green Crystal Powder
Sinochembt
25 Kgs Fiber Drums
99.5%
Shenyang
29270000
Product Description
Thymol blue (thymolsulfonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions.
| Thymol blue (pH indicator) | ||
| below pH 8.0 | above pH 9.6 | |
| 8.0 | ⇌ | 9.6 |
| Thymol blue (pH indicator) | ||
| below pH 1.2 | above pH 2.8 | |
| 1.2 | ⇌ | 2.8 |
It transitions from red to yellow at pH 1.2-2.8 and from yellow to blue at pH 8.0-9.6. It is usually a component of Universal indicator.
At wavelength (378 - 382) nm, extinction coefficient > 8000 and at wavelength (298 - 302) nm , the extinction coefficient > 12000
GB/T 15352-94Item (IND)
pH Visual transition interval: 1.2(Red)~2.8(Yellow)
8.0(Yellow)~9.6(Blue)
Mass absorptivity,L/(cm.g):≥71.0
Solubility in ethanol: Pass
Ignition residue,%:≤0.3
Grade ACS
(ACS reagent, 95 %)
Appearance brownish-green or reddish-brown crystalline powder
Infrared spectrometry Conforms
Dye content, 95%
Purity 221-224 °C
Wavelength 595 - 599 nm
Extinction Coefficient ≥30000
Wavelength 378 - 382 nm
Extinction Coefficient ≥8000
Wavelength 298 - 302 nm
Extinction Coefficient ≥12000
c = 0.01g/l, 0.1N NaOH
visual transition interval:
acid range: pH 1.2 (red) to pH 2.8 (yellow)
alkaline range: pH 8.0 (yellow) to pH 9.2 (blue)
