Methyl Red#493-52-7

Methyl Red#493-52-7

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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
Mode of Transportation
1. By Air, fast but expensive.
2. By Sea, usual and economy.
3. By Train, suit for middle Asia countries.
4. By Express, suit for small package.
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Product Description

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 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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