ALIZARINE RED S

ALIZARINE RED S AR

C.I.No. 58005 Acid base indicator use in analysis of metals
Sodium Alizarine Sulphonate

Article No.

00861

Grade

Purity

CAS No.

130-22-3

Molecular Formula

C₁₄H₇NaO₇S

Molecular Weight

342.3

H.S. Code

2914.7990

Shelf Life

60 Months

MSDS

Certificate of Analysis (COAs)

Physical state at 20 °C

Solid

Colour

Red powder

Melting point/ Freezing point [°C]

430°C

Boiling point [°C]

287 - 289°C

Initial boiling point [°C]

287°C

Final boiling point [°C]

289°C

Solubility in water [% weight]

Sparingly soluble in water

Appearance	Yellow to orange to brown powder
Dye content	Min 70.0%
Transition range
pH 4.3-6.3	Yellow-Pink
pH 9.4-12.0	Brown orange-Violet
Solubility (0.1% in water)	Clear solution
Absorption maxima (0.1 mol/L in NaOH) λmax1	553-559 nm
Absorption maxima (0.1 mol/L in NaOH) λmax2	592-599 nm
Absorptivity (A1%/1cm at 556 nm )	Min 350.0
Absorptivity (A1%/1cm at 595 nm )	Min 325.0
Loss on drying (at 110°C)	Max 5.0%