Tropaeolin O TCI R0010

Chemical Identity

CAS No.: 547-57-9
PubChem: CID 2728027·SID 87575592
Formula: C12H9N2NaO5S
Molecular weight: 316.27 g/mol
Reference databases: ChemSpider·ECHA·Wikipedia

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: sodium 4-[(2,4-dihydroxyphenyl)diazenyl]benzenesulfonate
SMILES: C1=CC(=CC=C1N=NC2=C(C=C(C=C2)O)O)S(=O)(=O)[O-].[Na+]
InChIKey: COEZWFYORILMOM-UHFFFAOYSA-M

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Tropaeolin O is an acid dye widely used in chemical experiments and laboratory analyses. It serves as a valuable tool for identifying metal ions and monitoring pH changes in solutions. Its chemical stability makes it a reliable indicator in various chemical reactions, particularly in qualitative analysis. As a versatile coloring agent, Tropaeolin O is commonly found in research and educational settings, supporting both teaching and experimental work. Its ability to provide consistent and accurate results enhances the reliability of laboratory procedures.

One of the key properties that make Tropaeolin O a preferred choice is its solubility in organic solvents, which simplifies its use in analytical procedures. It exhibits a distinct reddish-yellow color and emits light at specific wavelengths, making it suitable for spectrophotometric applications. Additionally, it is resistant to moderate light and temperature exposure, ensuring long-term stability and usability. These characteristics contribute to its effectiveness in both routine and specialized laboratory tasks.

In Indonesian laboratories, Tropaeolin O is frequently used in chemistry education and research. It plays a crucial role in helping students and researchers visualize chemical reactions and understand analytical techniques. Its practicality and reliability make it an essential component in both academic and industrial laboratory environments. The dye's consistent performance supports a wide range of applications, from basic experiments to advanced analytical methods.

TCI brochures (PDF)

Titration Reagents and TLC Stains 2026-05-07 · p. 3

Related TCI products

Metal ion identification in qualitative analysis due to its distinct color change properties.
pH monitoring in solution analysis because of its sensitivity to acidic and basic environments.
Spectroscopic studies for its ability to emit light at specific wavelengths.
Educational demonstrations to illustrate chemical reactions and colorimetric changes.
Colorimetric assays for detecting trace elements in complex mixtures.

Brand	TCI
CAS number	547-57-9
Molecular formula	—
Purity	—
Category	Chemistry > Stains and Dyes (for Research and Experimental Use) > Acid Dyes (for Research and Experimental Use)
Pack sizes	Available in standard laboratory quantities as per supplier specifications.
Physical form	Powder or solid, depending on packaging.
Storage	Store in a cool, dry place away from direct sunlight.

Tropaeolin O should be stored in a cool, dry environment to maintain its chemical stability. It is recommended to keep it in a sealed container to prevent contamination and moisture absorption. Avoid exposure to direct sunlight and high temperatures to preserve its properties. When handling, ensure proper personal protective equipment is used, such as gloves and safety goggles. It is important to store it away from incompatible substances to prevent any adverse reactions. Regular inspection of storage conditions ensures the material remains effective for laboratory use.

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