Merck 1072411000 苯酚红 (C₁₉H₁₄O₅S, metal can 1kg)

CAS #: 143-74-8

EC number: 205-609-7 

Hill Formula: C₁₉H₁₄O₅S 

Molar Mass: 354.38 g/mol

Identity (UV/VIS-Spectrum): passes test

Clarity of solution (1 g/l; ethanol): passes test

1st transition range: pH 1.2 - pH 3.0 brownish orange - yellow

2nd transition range: pH 6.5 - pH 8.0 brownish yellow - red violet

Absorption maximum λ 1 max. (buffer pH 1,2): 503 - 506 nm

Absorption maximum λ 2 max. (buffer pH 3,0): 430 - 435 nm

Absorption maximum λ 3 max. (buffer pH 6.5): 430 - 435 nm

Absorption maximum λ 4 max. (buffer pH 8,0): 557 - 560 nm

Spec. Absorptivity A 1%/1cm (λ 1 max.; 0.005 g/l; buffer pH 1,2; calc. on dried substances): 900 - 1150

Spec. Absorptivity A 1%/1cm (λ 2 max.; 0.005 g/l; buffer pH 3,0; calc. on dried substances): 550 - 650

Spec. Absorptivity A 1%/1cm (λ 3 max.; 0.005 g/l; buffer pH 6.5; calc. on dried substances): 550 - 650

Spec. Absorptivity A 1%/1cm (λ 4 max.; 0.005 g/l; buffer pH 8,0; calc. on dried substances): 1000 - 1250

Loss on drying (110 °C): ≤ 1

Transition range (according to ACS): pH 5,8 - pH 8,2 yellow - red