Description
Orange II sodium salt (C.I. 15510) is an azo dye supplied for microscopy and related laboratory indicator work. It is characterised by CAS number 633-96-5, EG number 211-199-0, and the empirical formula C₁₆H₁₁N₂NaO₄S, with a molar mass of 350,33 g/mol and a density of 1,53 g/cm³. Under Colour Index designation C.I. 15510, the sodium salt form is used where an orange dye response is needed in staining or analytical colour-change procedures. The product is Typical laboratory contexts include biological staining support, teaching microscopy, and indicator applications that rely on a defined orange azo dye. Orange II sodium salt from manufacturer Carl ROTH offers clear chemical identification for method write-ups and inventory control. Physical data such as molar mass and density assist formulation calculations when dissolving the solid for working solutions. The glass presentation supports clean handling and storage of the dye solid between successive preparations in research, quality-control, and educational laboratories.
This article is part of Reference substances & reagents (other), in Analytical standards & reference materials.
Key features
- Appearance: orange to brown powder
- pH-transition range: 10,2 (orange)-11,8 (red)
- CAS number: 633-96-5
- Pack sizes: 5 g, 25 g, 100 g
- EG nr.: 211-199-0
- Empirical formula: C₁₆H₁₁N₂NaO₄S
- Molar mass: 350,33 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
DangerHazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Orange II sodium salt (C.I. 15510), for microscopy, 5 g, glass
What is this article?
Orange II sodium salt (C.I. 15510), for microscopy, 5 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Reference substances & reagents (other), inside Analytical standards & reference materials, in Lab chemicals.
A reference substance has a stated identity and a stated content, used to check a method or to standardise a titration. It is a more tightly specified article than a reagent grade bottle of the same name. The lot's certificate is part of the product.
A reference material is the article against which another result is compared. Its value is stated, and the uncertainty of that value is part of the product. An ICP or ion standard is a solution of known concentration. A volumetric standard is for titration. A chromatography standard is the peak you match. The grade names, including pharmacopoeia and ASTM, say which impurities were limited. Identity is checked on PubChem. Names follow IUPAC. Medicinal grades follow the European Pharmacopoeia and USP.
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The category is Analytical standards & reference materials. The sub-category is Reference substances & reagents (other). The catalogue is Lab chemicals.
Shelves beside this one are ICP, AAS & ion standards, Chromatography standards (GC, HPLC, pesticides), Volumetric standard solutions (titration), Reagents for analysis (Ph. Eur., ASTM, DIN), Spectroscopy & physical property standards and Indicators & indicator solutions.
What should I check before I order?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
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