Methyl Red cas 493-52-7

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Chemical Name:  Methyl Red 

CAS: 493-52-7

Molecular Formula:C15H15N3O2

Molecular Weight: 269.3

Appearance: red powder 

Assay: 99% min 

Item Standard
pH Colour Change Ranges 4.5(red)-6.2(yellow)
wavelength of maximum absorption/nm
λ1(pH=4.5) 523-528  
λ2(pH=6.2) 427-437  
Mass absorption coefficient[L/(cm·g)]
 α·pH=4.5 dry basis) ≥130  
α·pH=6.2 dry basis) ≥70  
Ethanol dissolution test Qualified  
Loss on drying ≤1.0%  
Residue on ignition ≤0.2%

pH indicator in pH range 4.2 – 6.3Methyl red is used as a pH indicator. It is red in pH less than 4.4 and yellow in pH over 6.2. It is used to study its degradation using Fenton’s reagent. In microbiology, it is used to identify bacteria producing stable acids by mechanisms of mixed acid fermentation of glucose.

25kg/bag;25kg/drum; as customer requirement
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