Home Categories Biochemical Engineering Methyl red
A5348912

Methyl red , ACS , 493-52-7

Synonym(s):
2-(4-Dimethylaminophenylazo)benzoic acid;4-Dimethylaminoazobenzene-2′-carboxylic acid;Acid Red 2;Methyl red (C.I. 13020);Methyl red indicator solution

CAS NO.:493-52-7

Empirical Formula: C15H15N3O2

Molecular Weight: 269.3

MDL number: MFCD00002425

EINECS: 207-776-1

Pack Size Price Stock Quantity
25G RMB63.20 In Stock
50g RMB111.20 In Stock
100g RMB175.20 In Stock
500g RMB719.20 In Stock
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Update time: 2022-07-08

PRODUCT Properties

Melting point: 179-182 °C (lit.)
Boiling point: 412.44°C (rough estimate)
Density  0.839 g/mL at 25 °C
vapor density  9.3 (vs air)
refractive index  1.5930 (estimate)
Flash point: 11 °C
storage temp.  Store at +5°C to +30°C.
solubility  ethanol: soluble1mg/mL
Colour Index  13020
form  Solid
pka 4.95(at 25℃)
color  Reddish-violet
Odor Odorless
PH Range 4.4(red)-6.3(yellow)
Water Solubility  Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
λmax 410nm, 530nm, 427nm, 519nm
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

Description and Uses

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.

Safety

Symbol(GHS) 
GHS02,GHS07,GHS08
Signal word  Danger
Hazard statements  H225-H319-H371
Precautionary statements  P210-P260-P280-P308+P311-P337+P313-P403+P235
Hazard Codes  Xn,T,F,Xi,C,N
Risk Statements  10-20/21/22-68/20/21/22-68-36/38-23/25-11-36/37/38-34-51/53-39/23/24/25-23/24/25
Safety Statements  36/37-24/25-22-45-33-24-16-7-36-26-36/37/39-61
RIDADR  UN 1170 3/PG 2
WGK Germany  1
RTECS  DG8960000
TSCA  Yes
HazardClass  3
PackingGroup  II
HS Code  29270000

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