Xylenol Blue
Xylenol Blue (CAS: 125-31-5; Formula: C23H22O5S; Molar Mass: 410.48 g/mol) is a widely used pH indicator. It exhibits distinct colour transitions in both acidic and alkaline ranges, making it valuable in titration and various analytical procedures. Supplied by Tech Serve Solutions in indicator grade, Xylenol Blue is essential for accurate laboratory measurements in chemical analysis and biological studies.
- IUPAC
- p-Xylenolsulfonephthalein,p-Xylenol Blue
- Synonyms
- p-Xylenolsulfonephthaleinp-Xylenol Blue
pH Indication
Xylenol Blue functions as a visual indicator for pH changes. It transitions from red to yellow in acidic conditions (pH 1.2–2.8) and from yellow to violet in alkaline conditions (pH 8.0–9.8).
Titration Analysis
This compound is employed in acid-base titrations to determine the endpoint visually. Its sharp colour change facilitates precise endpoint detection in quantitative chemical analysis.
Laboratory Reagent
As a versatile laboratory reagent, Xylenol Blue finds applications in general chemical testing, qualitative analysis, and educational demonstrations requiring pH observation.
Histology and Cell Biology
While primarily a pH indicator, its specific staining properties may be leveraged in certain histological or cell biology applications requiring differential staining or pH assessment.
| Molecular weight | 410.48 |
|---|---|
| Empirical formula | C23H22O5S |
| Grade | indicator grade |
| Composition | Dye content, 90% |
| Melting point | 212 °C (dec.)(lit.) |
Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | λmax 424 nm |
|---|---|
| Useful Ph Range | 1.2 - 2.8, red to yellow (acid)8.0 - 9.8, yellow to violet (alkaline) |
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 Blue used for?
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Xylenol Blue is primarily used as a pH indicator, showing distinct colour changes in both acidic (red to yellow, pH 1.2-2.8) and alkaline (yellow to violet, pH 8.0-9.8) ranges, making it useful for titrations and general laboratory analysis.
What are the CAS number and formula for Xylenol Blue?
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The CAS number for Xylenol Blue is 125-31-5, and its molecular formula is C23H22O5S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Xylenol Blue in indicator grade with a dye content of approximately 90%. We do not represent this product as USP, BP, EP, or pharmacopoeia grade.
What are the primary safety concerns when handling Xylenol Blue?
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Xylenol Blue is a warning substance that can cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Handle with appropriate personal protective equipment, including a dust mask (N95), eyeshields, and gloves, in a well-ventilated area.
How is Xylenol Blue packed, shipped, and exported by TSS?
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Tech Serve Solutions professionally packs and exports Xylenol Blue globally, adhering to all necessary chemical shipping regulations to ensure safe and compliant delivery.
How can I request a sample or quote for Xylenol Blue?
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To request a sample or a quote for Xylenol Blue, please contact our sales team through the website or by phone, providing your specific requirements.
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