Methyl red photograph

Methyl Red

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FormulaC15H15N3O2
Density791 kg/m³
Molar mass269. 304 g·mol−1
Solubility ethanol
Melting point179–182 °C (354–360 °F; 452–455 K)
UV-vis (λmax)410 nm
Date of Reg.
Date of Upd.
ID1130247
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About Methyl Red


Methyl red, 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.

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