Methyl Red CAS 493-52-7 C. I. 13020 Acid Red 2

Product Description

Product Description

Methyl Red

Name	Methyl Red
Synonyms	C.I. 13020; Acid Red 2; 2-[4-(Dimethylamino)phenylazo]benzoic acid
Molecular Structure
Molecular Formula	C15H15N3O2
Molecular Weight	269.30
CAS Registry Number	493-52-7
EC Number	207-776-1

Properties

Melting point	178-182 ºC

 

Chemical Property/Description:

Purple crystals with lustre OR reddish-brown powder.

After long-term storage, the sensitivity of ethanol solution can be significantly reduced due to the esterification effect of carboxyl groups; PH color change range 4.2 (pink) -6.2 (yellow); λmax:410nm. Soluble in sodium hydroxide solution, benzene, chloroform, and acetic acid, slightly soluble in ethanol and petroleum ether, insoluble in water. Melting point 178-182 ºC.

Main Uses:

Live staining of protozoa.

Acid base indicator, pH color change range 4.4 (red) -6.2 (yellow).

Titrate ammonia, weak organic bases, and alkaloids, but not applicable to organic acids other than oxalic acid and picric acid.

A mixed indicator can be formed with bromocresol green and methylene blue to shorten the color gamut and improve the sensitivity of color change.

Adsorption indicators for precipitation titration, such as using thorium nitrate to titrate fluoride ions. Verify free chlorine, chlorite and other oxidants.
 

Specification

Item	Specification
Appearance	Purple crystals with lustre OR reddish-brown powder
PH ranges	pH 4.5 (red) to pH 6.2 (yellow)
Quality absorption coefficient α1(λ1,pH 4.5)/(L/cm·g)	≥130.0
Quality absorption coefficient α2(λ2,pH 6.2)/(L/cm·g)	≥70.0
Absorption maximum λ1(pH=4.5)/(L/cm·g)	523~528
Absorption maximum λ2(pH=6.2)/(L/cm·g)	427~437
Solubility in ethanol	Pass
Residue on ignition(as SO4),%	≤0.2%
Loss on drying,%	≤1.0%

 

Detailed Photos

FAQ

Question 1: Can I get samples?
Answer: Yes,you can get free samples of our most products,
while the courier cost will be borne by the buyers.

Question 2: What's your MOQ?
Answer: For a express delivery order,the MOQ is usually 100 g~1 kg;
for an air transport order or sea delivery order ,the MOQ is usually 25 kgs.

Question 3: What's your delivery time?
Answer:
Orders shipped by express delivery,the delivery time is usually 5~7 working days;
Orders shipped by air transport,usually around 7~10 working days;
Orders shipped by sea , usually around 2~3 working weeks.

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Question 5: How do you treat quality complaint?
We take quality very seriously, it is one of the founding principles of our business.
 If the quality problem actually exists, we will replace with qualified goods or refund the money.