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Code: km-306 Product name: Phenol Red CAS No. 143-74-8 MF: C19H14O5S MW: 354.38 PH indicator range: 1.2 (orange) -3.0(yellow) 6.5(yellow-brown)- 8.0(purple) Maximum absorption wave-length(nm): λ1(PH1.2) 503---506 λ2(PH 3.0) 430---435 λ3(PH 6.5) 430---435 λ4(PH 8.0) 557---560 Mass absorption coefficient(L/cm·g) α1 (λ1,PH 1.2,dry sample)110---123 α2 (λ2,PH 3.0,dry sample)60---68 α3 (λ3,PH 6.5,dry sample)62---72 α4 (λ4,PH 8.0,dry sample)115-130 Solution test in alkali: qualified Loss on drying: 1.0%max Residue on ignition (as sulfate): 0.2%max