High quality Phenol Red Cas .143-74-8

Items

Technical index 

Product name

Phenol Red 

Synonym

Phenolsulfonephthalein

Appearance

Dark red powder

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(PH3.0)  430---435

λ₃(PH6.5)  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,PH3.0,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