Methyl red sodium salt is a high-grade reagent supplied by Research Lab Fine Chem Industries. Few other chemical names used to denote this reagent include, Methyl Red sodium, Methyl Purple Solution, benzoic acid and 2-[[4-(dimethylamino)phenyl]azo]- sodium salt. It is available in the form of a yellowish-brown coloured solid powder. Methyl red sodium salt is soluble in cold water and partially soluble in methanol. It is stable as long it is stored as per the recommended storage conditions. It is non-corrosive in the presence of glass. Excess heat, incompatible materials, excess dust generation may cause this reagent to become unstable. Methyl red sodium salt is incompatible with oxidising agents. CAS No. 845-10-3 Quantity provided: 25 gm/bottle Molecular formula: C15H14N3NaO2 Molecular weight: 291.286 g/mol Assay: Minimum 95%Methyl Red sodium salt is nothing but the sodium salt of Methyl Red. Methyl red is an indicator dye that turns red in acidic solutions. It is a pH indicator, turning red under pH 4.4, yellow over pH 6.2, and orange in between those values. It is used in microbiology in the Voges-Proskauer test to identify bacteria that produce stable acids through mixed acid fermentation of glucose. Methyl-red positive bacteria include Proteus vulgaris and Escherichia coli. Methyl-red negative bacteria include Enterobacter aerogenes and Serratia marcescens.