547-58-0 Usage
Description
Methyl orange is an orange, azoic dye. It has a transition range from 3.1 to 4.4. Methyl orange does not have a full spectrum of color change, but has a sharper end point. Methyl orange shows red color in acidic medium (pH < 3.1) and yellow color in basic medium (pH > 4.4).
It is used as a pH-indicator in 0.1% aqueous solution for the titration of mineral acids (not organic acids) and strong bases. Methyl orange is also used in dyeing and printing textiles as a dyestuff.
References
[1] https://en.wikipedia.org/wiki/Methyl_orange
[2] Mohammed Bassim Alqaragully (2014) International Journal of Advanced Research in Chemical Science, 1, 48-59
Chemical Properties
Orange-yellow powder. Soluble in hotwater; insoluble in alcohol.
Uses
Different sources of media describe the Uses of 547-58-0 differently. You can refer to the following data:
1. As indicator in 0.1% aqueous solution. pH: 3.1 red, 4.4 yellow. Employed for titrating most mineral acids, strong bases, estimating alkalinity of waters; useless for organic acids. In dyeing and printing of textiles.
2. Methyl orange is a pH indicator frequently used in titrations, also used for histological microscopy.
Definition
Different sources of media describe the Definition of 547-58-0 differently. You can refer to the following data:
1. An acid–base indicator
that is red in solutions below a pH of 3 and
yellow above a pH of 4.4. As the transition
range is clearly on the acid side, methyl orange
is suitable for the titration of an acid
with a moderately weak base, such as
sodium carbonate.
2. methyl orange: An organic dyeused as an acid–base indicator. Itchanges from red below pH 3.1 toyellow above pH 4.4 (at 25°C) and isused for titrations involving weakbases.
Preparation
4-Aminobenzenesulfonic acid diazo, and N,N-dimethylaniline coupling.
Air & Water Reactions
Azo dyes can be explosive when suspended in air at specific concentrations. Insoluble in water.
Reactivity Profile
Methyl Orange is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.
Properties and Applications
orange. The strong sulfuric acid for green light yellow, diluted into red orange. The dye solution to join strong hydrochloric acid for orange red; Add thick sodium hydroxide solution for green light yellow.
Standard
Light Fastness
Soaping
Persperation Fastness
Oxygen bleaching
Fastness to seawater
Fading
Stain
Fading
Stain
Fading
Stain
ISO
AATCC
Standard
Light Fastness
Fading
Stain
Purification Methods
Recrystallise it twice from hot water, then wash it with a little EtOH followed by diethyl ether. It is an indicator: pH 3.1 (red) and pH 4.4 (yellow). [Beilstein 16 IV 510.]
Check Digit Verification of cas no
The CAS Registry Mumber 547-58-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,4 and 7 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 547-58:
(5*5)+(4*4)+(3*7)+(2*5)+(1*8)=80
80 % 10 = 0
So 547-58-0 is a valid CAS Registry Number.
InChI:InChI=1/C14H15N3O3S.Na/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20;/h3-10H,1-2H3,(H,18,19,20);/q;+1/p-1/b16-15-;
547-58-0Relevant articles and documents
Molecular Assemblies Offering Hydrogen-Bonding Cavities: Influence of Macrocyclic Cavity and Hydrogen Bonding on Dye Adsorption
Gupta, Rajeev,Gupta, Ruchika,Pachisia, Sanya
supporting information, p. 3616 - 3630 (2022/03/02)
This work presents a set of Hg macrocycles of amide-phosphine-based ligands offering H-bonding cavities of different dimensions. Such macrocycles are shown to selectively adsorb anionic dyes followed by neutral dyes as well as Prontosil, a biologically relevant antibiotic, within their cavities with the aid of H-bonding-assisted encapsulation. Kinetic experiments supported by spectroscopic and docking studies illustrate the importance of the cavity structure as well as H-bonds for the selective adsorption of dyes.
PROCESS FOR THE SYNTHESIS OF ARYLDIAZONIUM SALTS USING NITROGEN OXIDES IN OXYGEN-CONTAINING GAS STREAMS, ESPECIALLY FROM INDUSTRIAL WASTE GASES
-
Page/Page column 43, (2017/06/30)
The present invention relates to a process for the synthesis of aryldiazonium salts using nitrogen oxides in oxygen-containing gas streams, especially from industrial waste gases.
Interaction of Methyl Orange with Submicellar Cationic Surfactants
Dutta, Robin K.,Bhat, Subray N.
, p. 2457 - 2460 (2007/10/02)
The interaction of aqueous Methyl Orange (MO), an azo dye, with alkyltrimethylammonium and N-hexadecylpyridinium halide surfactants in submicellar concentration ranges has been investigated.The interaction gives rise to a new absorption band of MO with a maximum at ca. 370 nm, and the appearance of the new band has been attributed to change in the chromophore microenvironment in water structure enforced closely packed ion pairs of the dye with submicellar cationic surfactant.The strength of the interaction depends on the alkyl chain length of the surfactant, the surfactant head group and the counter ions.
