Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound
Methyl yellow, or C.I. 11020, is an organic compound with the formula C6H5N2C6H4N(CH3)2. It is an azo dye derived from dimethylaniline. It is a yellow solid. According to X-ray crystallography, the C14N3 core of the molecule is planar.[3]
It is used as a dye for plastics and may be used as a pH indicator.
Methyl yellow(pH indicator)
below pH 2.9
above pH 4.0
2.9
⇌
4.0
In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.
^ abcdDimethyl yellow
^ abcdNIOSH Pocket Guide to Chemical Hazards. "#0220". National Institute for Occupational Safety and Health (NIOSH).
^Whitaker A (1992). "Crystal and molecular structure of C.I. Solvent Yellow 2, 1-Phenylazo-4 (N,N-dimethylamine)-phenyl". Journal of Crystallographic and Spectroscopic Research. 22 (2): 151–155. doi:10.1007/BF01186250. S2CID 93052691.
Methylyellow, or C.I. 11020, is an organic compound with the formula C6H5N2C6H4N(CH3)2. It is an azo dye derived from dimethylaniline. It is a yellow...
powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1. Murexide and methyl red...
finally, to yellow—with the reverse process occurring in a solution of increasing acidity. In a solution that decreases in acidity, methyl orange moves...
implicated as the origin. Despite the fact that methylyellow can often be detected by color (bright yellow), a further scandal erupted in the following...
xylene. It appears yellow in solution of low pH (~0.15) and changes to violet with pH increasing toward 3.2. Methyl violet 10B has six methyl groups. It is...
material. Methylyellow (p-dimethylaminoazobenzene) is a pH indicator used to determine acidity. It changes from yellow at pH 4.0 to red at pH 2.9. Yellow fireworks...
colorless liquid, although aged samples appear yellow. It is also known for its pungent odor. Methyl chloroformate can be synthesized using anhydrous...
DAB, a digital radio transmission standard 4-Dimethylaminoazobenzene (methylyellow), a pH indicator Dabbing, a method of making metal casts from a wooden...
Methyl anthranilate, also known as MA, methyl 2-aminobenzoate, or carbomethoxyaniline, is an ester of anthranilic acid. Its chemical formula is C8H9NO2...
one of the species is colorless, whereas in other indicators, such as methyl red, both species confer a color. While pH indicators work efficiently at...
usually composed of water, 1-propanol, phenolphthalein, sodium hydroxide, methyl red, bromothymol blue, sodium bisulfite, and thymol blue. The colours that...
and November. Several compounds produced by this mushroom, for example methyl gallate, are of interest for their medicinal properties. It was originally...
Crystal violet or gentian violet, also known as methyl violet 10B or hexamethyl pararosaniline chloride, is a triarylmethane dye used as a histological...
substances found in the samples, such as borax, rhodamine, formaldehyde and Methylyellow —used as a dye—are not fit for consumption.[citation needed] Food contamination...
base with methyl ketones is so reliable that the iodoform test (the appearance of a yellow precipitate) is used to probe the presence of a methyl ketone...
Methyl dihydrojasmonate is an aroma compound that smells similar to jasmine. In racemic mixtures the odor is floral and citrus while epimerized mixtures...
Wintergreen oil is a pale yellow or pinkish fluid liquid that is strongly aromatic with a sweet, woody odor (components: methyl salicylate (about 98%),...
Methyl nitrite is an organic compound with the chemical formula CH 3ONO. It is a gas, and is the simplest alkyl nitrite. At room temperature, methyl nitrite...
the solution being acidic at the equivalence point and indicators such as methyl orange and bromothymol blue being most appropriate. Titrations between a...
Carotenoids (/kəˈrɒtɪnɔɪd/) are yellow, orange, and red organic pigments that are produced by plants and algae, as well as several bacteria, archaea, and...
"phenyldiazoacetate", it is generated and used in situ after isolation as a yellow oil. Methyl phenyldiazoacetate and many related derivatives are precursors to...
Methylmercury (sometimes methyl mercury) is an organometallic cation with the formula [CH3Hg]+. It is the simplest organomercury compound. Methylmercury...
Methyl isonicotinate is a toxic compound, which is used as a semiochemical. Other names for this compound are 4-pyridine carboxylic acid, and isonicotinic...
Bathocuproine is a derivative of 1,10-phenanthroline with two methyl groups and two phenyl groups in the 2,9 and 4,7 positions, respectively. Like 1,10-phenanthroline...
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