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Methyl Red#493-52-7

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Chemical Name：Methyl Red

CAS No.:493-52-7

Molecular Formula：C15H15N3O2

Sample: Available

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Product Details

Methyl Red#493-52-7

Methyl Red is usually a lustrous purple crystal or reddish-brown powder. It is almost insoluble in water but soluble in ethanol, chloroform and acetic acid. It is mainly used in acid-base titration to indicate the pH value of the solution and determine the titration endpoint through color changes.

Methyl Red#493-52-7

Methyl Red Chemical Properties

Melting point	179-182 °C (lit.)
Boiling point	412.44°C (rough estimate)
density	0.839 g/mL at 25 °C
bulk density	300-500kg/m3
vapor density	9.3 (vs air)
refractive index	1.5930 (estimate)
Fp	11 °C
storage temp.	Store at +5°C to +30°C.
solubility	ethanol: soluble1mg/mL
form	Solid
pka	4.95(at 25℃)
Colour Index	13020
color	Reddish-violet
PH Range	4.4(red)-6.3(yellow)
Odor	Odorless
Water Solubility	Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
λmax	410nm, 530nm, 427nm, 519nm
ε(extinction coefficient)	≥10000 at 282-288nm in methanol ≥20000 at 509-519nm in methanol ≥7000 at 329-335nm in methanol
Merck	14,6119
BRN	750102
Stability:	Stable. Incompatible with strong oxidizing agents.
Major Application	Waveguides, LED sensors, photoresists, liquid crystals, sol-gel matrix, optical sensors, paints, toys, detection of thiols, food freshness sensors, dental product, saliva sampling method, detecting lactic acid, carbohydrates
InChIKey	CEQFOVLGLXCDCX-MSUUIHNZSA-N
CAS DataBase Reference	493-52-7
NIST Chemistry Reference	Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)
IARC	3 (Vol. 8, Sup 7) 1987
EPA Substance Registry System	Methyl red (493-52-7)

Product Usage

As indicator in 0.1% alcoholic solution; pH: 4.4 red, 6.2 yellow. Used for titrating NH3, weak organic bases, e.g., alkaloids; not suitable for organic acids, except oxalic and picric acid. Methyl red is easily reduced, thereby losing its color, and readings should be made promptly. It is gradually being replaced by sulfonphthalein indicators, such as bromcresol green, which are more stable and exhibit a sharper change in color.

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