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Methyl Red 493-52-7

Specification
Items  Standard
Max absorption wavelength，
λ1 (PH4.5), nm, λ2 (PH6.2), nm		 523~528
427~437
Mass absorption coefficient,
λ1 (PH4.5), L/(cm·g), λ2 (PH6.2), L/(cm·g)  		 ≥130
 ≥70
Ethanol dissolution test Pass
Residue on ignition (SO42-)  ≤0.2
Ph 4.5（Red）~6.2（Yellow）
Loss on drying   ≤1.0
 
Application
(1) Methyl Red is used as indicator in 0.1% alcoholic solution; pH: 4.4 red, 6.2 yellow.
 
(2) Methyl Red also used for titrating NH3, weak organic bases, e.g, alkaloids;
 

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