Description
m-Cresol purple is a p.a. grade pH indicator with CAS number 2303-01-7 and empirical formula C₂₁H₁₈O₅S. The molar mass is 382,43 g/mol and the EG number is 218-960-6, providing clear chemical identification for analytical work. The material is available from manufacturer Carl ROTH for analytical chemistry applications that specify m-cresol purple of pro analysi quality. Its defined composition supports reproducible colour-change behaviour when preparing indicator solutions according to established methods. The small glass unit is practical for method development, teaching laboratories and routine quality-control use where only modest quantities are required. Laboratories selecting indicators for acid–base systems can rely on this p.a. grade m-cresol purple when CAS 2303-01-7 and the corresponding molecular formula are required in the protocol.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance: Reddisch brown to green powder
- Assay: ≥90,0 %
- pH-transition range: 7.4 (yellow)-9.0 (purple)
- Maximum absorption: env.579 nm
- CAS number: 2303-01-7
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 218-960-6
- Empirical formula: C₂₁H₁₈O₅S
- Molar mass: 382,43 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about m-Cresolpurpur, p.a., 1 g, glass
What is this article?
m-Cresolpurpur, p.a., 1 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Analytical grade solvents (p.a.), inside Solvents, in Lab chemicals.
An analytical-grade solvent, often marked p.a., has impurity limits tight enough for classical analysis and for preparing reagents. It is not automatically low enough in UV absorbance for HPLC, and it is not dry enough for a water-sensitive reaction. The grade is the purchase.
A solvent dissolves. The grade says which impurities are low enough for the method. Analytical grade is the ordinary pure solvent. HPLC and LC-MS grades limit the absorbance and the ions that would become peaks or background. A dry solvent has had water removed. A deuterated solvent is for NMR, where the hydrogen signal would otherwise drown the sample. Technical grade is for cleaning and for synthesis that does not need a chromatogram. Identity is on PubChem. Names follow IUPAC. Hazards follow ECHA, the CLP Regulation and REACH.
Which category should I open next?
The category is Solvents. The sub-category is Analytical grade solvents (p.a.). The catalogue is Lab chemicals.
Shelves beside this one are HPLC & LC-MS grade solvents, Dry & deuterated solvents (NMR, synthesis), Technical & synthesis grade solvents and Green & alternative solvents.
What should I check before I order?
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