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Methyl Red Free Acid ACS

Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1.

Product Details

Category Dyes, Stains & Indicators
Price POA
CAS Number 493-52-7
Formula C15H15N3O2
Molecular Weight 269.30
Appearance red to maroon crystalline
Availability In Stock
Storage Conditions Room temperature

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