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Phenol red, indicator, ACS

- Synonyms: Phenolsulfonphthalein, PR
- C19H14O5S
- M = 354,38 g/mol
- CAS [143-74-8]
- EINECS-No.: 205-609-7
- Solub. in water: (20 ºC): almost insoluble
- Tariff number: 2934 99 90 90
- Applications: analytical chemistry, indicator.

SPECIFICATIONS
pH range (yellow-red): 6,8 - 8,2
clarity of solution: passes test
Absorption maximum l1 (pH 1,2): 503 - 506 nm
Absorption maximum l2 (pH 3,0): 430 - 435 nm
Absorption maximum l3 (pH 6,5): 430 - 435 nm
Absorption maximum l4 (pH 8,8): 557 - 560 nm
Absorptivity (A1%/1 cm; l1, on dried sample): 900 - 1100
Absorptivity (A1%/1 cm; l2; on dried sample): 500 - 700
Absorptivity (A1%/1 cm; l3 , on dried sample): 500 - 700
Absorptivity (A1%/1 cm; l4 , on dried sample): 1000 - 1200
insoluble in C2H5OH : passes test
copper (Cu): max. 0,005 %
iron (Fe): max. 0,005 %
lead (Pb): max. 0,005 %
nickel (Ni): max. 0,005 %
loss on drying (110 ºC): max. 5 %