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Thymol blue (thymolsulfonephthalein) is a brownish-green or reddish-brown crystalline powder pH indicator
Thymol Blue
Thymol blue (thymolsulfonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator
 
Catalog Number: ASC-1036
CAS Number: 76-61-9
MW: 466.60 g/mol
MF: C27H30O5S
 
Thymol Blue is a pH indicator commonly used in laboratory and research applications to monitor pH changes. It exhibits two distinct color transitions: red to yellow in acidic ranges (pH 1.2–2.8) and yellow to blue in basic ranges (pH 8.0–9.6). This versatility makes Thymol Blue essential for titrations, buffer solutions, and educational experiments. Available in high-purity grades to meet laboratory standards.

Thymol blue (thymolsulfonephthalein)

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  • Cat. Number ASC-1036
    CAS Number 76-61-9
    MDL Number MFCD00005869
    PubChem 310280971
    Molecular Weight 466.60 g/mol
    Molecular Formula C27H30O5S
    Storage Temperature +20°C
    Form and Color Powder, Dark Green to Brown or Black
    pH Transition Range(s) 1.2 – 2.8 (Red-Greenish Yellow)
    7.8 – 9.5 (Greenish Yellow-Blue)
    Solubility (0.1% in ethanol) Clear Solution
    Wavelength(s) of Maximum Absorption λ1: 431 – 436 nm (pH 7.8)
    λ2: 594 – 598 nm (pH 9.5)
    Absorptivity (E1%, 1cm cell) ≥ 200 (pH 7.8, λ1)
    ≥ 450 (pH 9.5, λ2)
    Loss on Drying ≤ 3.0%
    Dye Content ≥ 95.0%

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