Methyl Red ACS
Physical StateSolid
Appearancedark red to purple
Odornone reported
pHNot available
Vapor PressureNegliglble
Vapor DensityNot available
Evaporation RateNegligible
ViscosityNot available
Boiling PointNot available
Freezing/Melting Point179-182 deg C
Decomposition TemperatureNot available
SolubilityInsoluble in water
Specific Gravity/DensityNot available
Molecular FormulaC15H15N3O2
Molecular Weight269.30
Products : Methyl Red ACS Reag Ph. Eur , pH indicator
C.I. No. :13020
C15H 15N3O2 :M.W. 269.30
Absorption maxima:
1 (pH 4.5):523-526 nm
2 (pH 6.2):427-437nm
Clarity of alcohol solution: passes test
:
Absorptivity (on dried sub.):
(A 1 % 1cm at 1max pH 4.5):1330 -1430
(A1 %1cm at 2max ph 6.2):700 - 800
Visual transition:From pH 4.2 pink
interval: to pH 5.5 orange
:to pH 6.2 yellow
Melting point:179 -182 oC
Loss on drying (at 1100C):Max. 5.0%
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