Xylenol Orange tetrasodium salt
Xylenol Orange tetrasodium salt (CAS: 3618-43-7) is a complex organic compound with the empirical formula C31H28N2Na4O13S and a molecular weight of 760.58 g/mol. It functions as a vital indicator dye in analytical chemistry, particularly in complexometric titrations. This dye finds significant application in various laboratory settings for accurate chemical analysis and research, contributing to precise quantitative measurements.
- IUPAC
- 3,3′-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonephthalein tetrasodium salt
- Synonyms
- 3,3′-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonephthalein tetrasodium salt

Complexometric Titration Indicator
Xylenol Orange tetrasodium salt serves as an effective indicator for the complexometric titration of metal ions such as bismuth, thorium, and zirconium. Its distinct colour change signals the endpoint of the titration with high accuracy.
Analytical Reagent
This compound is utilised as a reagent in various analytical procedures within chemical laboratories. Its properties enable it to facilitate specific detection and quantification methods in research and quality control.
Spectrophotometric Analysis
With an absorption maximum at 580 nm, Xylenol Orange tetrasodium salt is suitable for spectrophotometric applications. It can be employed in methods requiring the measurement of light absorption at this specific wavelength for quantitative determination.
| Molecular weight | 760.58 |
|---|---|
| Empirical formula | C31H28N2Na4O13S |
| Melting point | 195 °C (dec.)(lit.) |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | λmax 580 nm |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Xylenol Orange tetrasodium salt used for?
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Xylenol Orange tetrasodium salt is primarily used as an indicator in complexometric titrations and as a reagent in analytical chemistry and spectrophotometric analysis.
What are the CAS number and formula for Xylenol Orange tetrasodium salt?
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The CAS number for Xylenol Orange tetrasodium salt is 3618-43-7, and its empirical formula is C31H28N2Na4O13S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Xylenol Orange tetrasodium salt, typically for research and laboratory use. The specific grade and purity are detailed in the product specifications; we do not represent this product as USP, BP, or EP grade unless explicitly stated.
What are the safety and handling requirements for Xylenol Orange tetrasodium salt?
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Handling Xylenol Orange tetrasodium salt requires appropriate personal protective equipment, including eyeshields and gloves. A respirator filter such as type N95 (US) or type P1 (EN143) is recommended. The compound is classified under WGK Germany 3, indicating a high hazard level for water.
How is Xylenol Orange tetrasodium salt shipped?
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Tech Serve Solutions expertly packs and ships fine chemicals globally, adhering to all necessary regulations for safe transport.
How can I request a sample or quote for Xylenol Orange tetrasodium salt?
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To request a sample or a quote, please contact our sales team through the website or by phone. Provide the product name and CAS number (3618-43-7) for prompt service.
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