Methyl Red CAS 493-52-7

Product Name: Methyl Red
CAS: 493-52-7
MF: C15H15N3O2
MW: 269.3
Appearance: Glossy purple crystals or reddish brown powder
Assay: 99% min
Melting point: 180~182℃
Package: 25kg/fiber drum

[Typical Properties]

Easy to soluble in ethanol and acetic acid, almost insoluble in water.

[Specification]

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)]
α₁(λ₁·pH=4.5 dry basis)	≥130
α₂(λ₂·pH=6.2 dry basis)	≥70
Ethanol dissolution test	Qualified
Loss on drying	≤1.0%
Residue on ignition	≤0.2%

[Usage]

Methyl red can be used for live animal staining, acid-base indicator (pH 4.4 to 6.2), and clinical serum protein biochemical testing. Its pH color change range is 4.4 (red) to 6.2 (yellow). It can titrate ammonia, weak organic bases, and alkaloids, but is not suitable for organic acids other than oxalic acid and picric acid; It can be used as a mixed indicator with bromocresol green and methylene blue to shorten the color gamut and improve the sensitivity of color change. It can also be used as an adsorption indicator for precipitation titration, such as titrating fluoride ions with thorium nitrate, and for detecting oxidants such as free chlorine and chlorite.

[Storage]

Keep tightly closed.Store in dry and ventilated place.Keep away from fire,heat sources and oxidants.

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