Methyl yellow

Methyl yellow
IUPAC name p-Dimethylaminoazobenzene
Another name 4-Dimethylaminoazobenzene, DAB, N,N-Dimethyl-4-phenylazoaniline, N,N-Dimethyl-4-aminoazobenzene, Butter Yellow, Solvent Yellow 2, C.I. 11020
Identification information
CAS registration number	60-11-7
PubChem	6053
ChemSpider	5829
UNII	A49L8E13FD
EINECS	200-455-7
ChEMBL	CHEMBL263116
RTECS number	BX7350000
SMILES N(=N/c1ccccc1)\c2ccc(N(C)C)cc2
InChI InChI=1S/C14H15N3/c1-17(2)14-10-8-13(9-11-14)16-15-12-6-4-3-5-7-12/h3-11H,1-2H3/b16-15+  Key: JCYPECIVGRXBMO-FOCLMDBBSA-N  InChI=1/C14H15N3/c1-17(2)14-10-8-13(9-11-14)16-15-12-6-4-3-5-7-12/h3-11H,1-2H3/b16-15+ Key: JCYPECIVGRXBMO-FOCLMDBBBF
Characteristic
Chemical formula	C14H15N3
Molar mass	225.29 g mol-1
The appearance	Yellow crystal
Melting point	111-116 degrees Celsius, 268 K, -66 degrees Fahrenheit The resolution [1])
Solubility to water	13.6 mg/l
log POW	4.58
The risk
GHS pictogram	[1]
GHS signal word	Dangerous (DANGER)
H phrase	H301, H351[1]
P phrase	P281, P301+310[1]
EU classification	T
The main risk	Cancer-causing material [2]
NFPA 704	1 2 0
R phrase	R25, R40
S phrase	S36/37, S45
Permissible exposure limit	OSHA regulation carcinogenesis material [2]
I can put a case, the data without the special mention for normal temperature (25 degrees Celsius), the ordinary pressure (100 kPa).

Methyl yellow (pH indicator)
PH 2.9 or less		More than pH 4.0
2.9	↔	4.0

Because a color changes in constant acidity, the methyl yellow (English: Methyl yellow) is a chemical substance used as a PH indicator. Another name: Butter yellow, C.I. 11020

I gradually vary from red to yellow from red, 2.9 to 4.0 in pH 2.9 or less and change into yellow in 4.0 or more.

Table of contents

Carcinogenic

Is classified in a cancer-causing agent, but is called butter yellow before it and want to be added in food now [³]; [⁴]. When I take it in, I cause tumor of the liver.

Allied item

• Methyl red
• en:Oil Yellow DE

Source

1. ^ ^{a b c d} Dimethyl yellow
2. ^ ^{a b} NIOSH Pocket Guide to Chemical Hazards 0220
3. ^ NIOSH Pocket Guide to Chemical Hazards 0220
4. ^ Opie, E. L. (1944). "The Pathogenesis of Tumors of the Liver Produced by Butter Yellow" (pdf). The Journal of Experimental Medicine 80 (3): 231–246. doi: 10.1084/jem.80.3.231. PMC 2135460. It is http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2135460/pdf/231.pdf. PMID 19871411 

Outside link

• International Chemical Safety Card 1498
• CDC - NIOSH Pocket Guide to Chemical Hazards

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