Methyl Red
Methyl Red (CAS 493-52-7), with the linear formula (CH₃)₂NC₆H₄N=NC₆H₄CO₂H and a molecular weight of 269.30, is a widely recognised acid-base indicator. It exhibits a distinct colour change from red in acidic solutions to yellow in alkaline solutions. This compound finds significant utility in analytical chemistry for titrations and is also employed in biological staining applications.
- IUPAC
- 2-(4-Dimethylaminophenylazo)benzoic acid,4-Dimethylaminoazobenzene-2′-carboxylic acid,Acid Red 2
- Synonyms
- 2-(4-Dimethylaminophenylazo)benzoic acid4-Dimethylaminoazobenzene-2′-carboxylic acidAcid Red 2
Acid-Base Indicator
Methyl Red is a common indicator used in acid-base titrations. Its sharp colour transition from red (pH 4.4) to yellow (pH 6.2) allows for precise endpoint determination in various analytical procedures.
Biological Staining
In histology and cell biology, Methyl Red serves as a dye. It is applied in specific staining techniques to visualise cellular structures or to differentiate tissues, contributing to microscopic analysis.
pH Determination
Beyond titrations, Methyl Red can be used in solution to provide a general indication of pH within its transition range, assisting in qualitative assessments of acidity or alkalinity.
| Molecular weight | 269.30 |
|---|---|
| Linear formula | (CH3)2NC6H4N=NC6H4CO2H |
| Melting point | 179-182 °C(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.
| Colour Index Number | 13020 |
|---|
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 Methyl Red used for?
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Methyl Red (CAS 493-52-7) is primarily used as an acid-base indicator in titrations, exhibiting a colour change from red in acidic conditions to yellow in alkaline conditions. It also finds applications in biological staining for histology and cell biology.
What are the CAS number and chemical formula for Methyl Red?
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The CAS number for Methyl Red is 493-52-7. Its linear formula is (CH₃)₂NC₆H₄N=NC₆H₄CO₂H.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Methyl Red. Please refer to the product's Certificate of Analysis for specific grade and purity details. We do not represent this product as USP, BP, or EP grade unless explicitly stated.
What are the safety and handling precautions for Methyl Red?
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Methyl Red requires appropriate personal protective equipment, including eyeshields and gloves. A respirator filter such as type N95 (US) or type P1 (EN143) is recommended. It is classified with a WGK rating of 3 in Germany, indicating a high hazard to water.
How is Methyl Red packed and shipped?
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Tech Serve Solutions exports fine chemicals globally, ensuring appropriate packaging and compliance with international shipping regulations for laboratory reagents.
How can I request a sample or quote for Methyl Red?
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To request a sample or a quote for Methyl Red, please contact our sales team through the provided channels on the Tech Serve Solutions website.
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