Methyl Purple
Methyl Purple (CAS: 1340-02-9) is a complex organic compound with the empirical formula C67H62N8Na4O14S3 and a molecular weight of 1391.41 g/mol. This chemical serves as a vital pH indicator, transitioning from violet to green within the pH range of 4.8 to 5.4. Its distinct spectral properties, with absorption maxima at 409 nm and 618 nm, make it useful in analytical chemistry and various laboratory applications.
- IUPAC
- Methyl Purple indicator solution

pH Indicator
Methyl Purple functions as a visual indicator for pH changes. Its colour shift from violet to green occurs within a specific pH range (4.8-5.4), enabling accurate determination of acidity or alkalinity in solutions.
Analytical Reagent
Utilised in titration and other analytical procedures where precise pH monitoring is crucial. Its defined spectral characteristics aid in spectrophotometric analyses.
Laboratory Staining
As a dye, Methyl Purple can be applied in histological and hematological staining techniques, aiding in the differentiation of cellular structures.
| Molecular weight | 1391.41 |
|---|---|
| Empirical formula | C67H62N8Na4O14S3 |
| Density | 1.001 g/mL at 25 °C |
| Concentration | in H2O |
| Absorption | λmax 409 nmλmax 618 nm (2nd) |
|---|---|
| Ph Range | 4.8 - 5.4, violet to green |
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 Purple used for?
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Methyl Purple is primarily used as a pH indicator due to its colour change in the pH range of 4.8-5.4 (violet to green). It also finds applications in analytical chemistry and as a laboratory stain.
What are the CAS number and formula for Methyl Purple?
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The CAS number for Methyl Purple is 1340-02-9 and its empirical formula is C67H62N8Na4O14S3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Methyl Purple. The specific grade and purity available are detailed in the product specifications. This product is not represented as USP/BP/EP.
How should Methyl Purple be handled safely?
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Methyl Purple is not classified as hazardous according to the provided data (WGK Germany: nwg). Standard laboratory safety precautions, including appropriate personal protective equipment, should still be observed when handling this chemical.
Is Methyl Purple a controlled substance?
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The provided data does not indicate that Methyl Purple is a controlled substance.
How is Methyl Purple packed and shipped?
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Tech Serve Solutions, as a global supplier and exporter, ensures appropriate packaging and shipping methods are employed for Methyl Purple, adhering to all relevant regulations for international transit.
How can I request a sample or quote for Methyl Purple?
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To request a sample or a quotation for Methyl Purple, please contact our sales team through the channels provided on the Tech Serve Solutions website.
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