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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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