Alizarin Red S

Chemical name: Alizarin Red S (Alizarin Red)

Molecular formula: C14H7NaO7S
Molar mass: 342.26 g/mol
CAS number: 130-22-3
EC number: 204-981-8

Physicochemical properties

• Physical form: solid
• Color: orange
• Odor: phenolic
• pH value (1 g/l, 20°C): 6-7
• Color change range: pH 3.7 - 5.2
• Solubility in water: 1 g/l (20°C)
• Solubility in organic solvents: no data
• Bulk density: approx. 340 kg/m³

Hazard statements

H-phrases: H315 - Causes skin irritation, H319 - Causes serious eye irritation, H335 - May cause respiratory irritation
P-phrases: P305+P351+P338 - IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Transport and classification

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

Application

Used as an indicator dye in chemical analysis, particularly in complexometry, and as a means of visualizing calcium compounds in biological and histological studies.

Storage conditions

Store in a dry, well-ventilated place in a tightly closed container. Protect from moisture and light. Storage temperature: 15-25°C.