Alizarin Red (Alizarin S) R-R 0.1% aqueous

Chemical name: Alizarin S, Alizarin Red

CAS number: 72-48-0
EC number: 200-783-3
Molecular formula: C14H7NaO7S
Molar mass: 360.26 g/mol

Physical and chemical properties

• Form: liquid (aqueous solution)
• Color: red
• Odor: no data available
• pH value: approx. 5 - 7 (1% solution, 20°C)
• Solubility: soluble in water

Hazard statements

H-statements: not applicable (for 0.1% solution)
P-statements: not applicable

Transport

• RID/ADR: not applicable
• UN: not applicable

Composition and purity

• Dye concentration: 0.1%
• Solvent: purified water
• Solution homogeneity: homogeneous liquid without sediment

Application

Used as an indicator in complexometric analysis (e.g. determination of alkaline earth metal ions and iron). The indicator changes its color depending on the presence of metal ions, e.g. from red to blue.

Storage conditions

Store in tightly closed containers, at room temperature and protected from light.