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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