| Identification | Back Directory | [Name]
Methyl Orange | [CAS]
547-58-0 | [Synonyms]
MO
orange3
oranziii
S NO 176
CI 13025
BETZ 0211
HELIANTHIN
ORANGE III
HELIANTHINE
HELIANTHISE
GOLD ORANGE
CI NO 13025
methyloranz
tropeolin D
helianthineb
TROPAEOLIN D
METHYL ORANGE
methylorangeb
oranzkysela52
oranzmethylova
ORANGE ACID 52
ciacidorange52
ACID ORANGE 52
kcamethylorange
eniamethylorange
c.i.acidorange52
MethylOrange,94%
abcolmethylorange
Methyl Orange, ACS
Methyl Orange
Helianthin Orange III
MethylOrangeC.I.13025
MethylOrangeIndicator
Methyl Orange solution
Methyl Orange, Reagent
METHYL ORANGE CERTIFIED
Acid Orange 52 C.I. 13025
MethylOrange(AcidOrange52)
METHYL ORANGE, SODIUM SALT
METHYL ORANGE REAGENT (ACS)
Methyl Orange (CI x 13025)
Methyl Orange,pure,indicator
METHYL ORANGE 0.04% SOLUTION
Methyl Orange,pure,certified
methyl orange for microscopy
STOCK METHYL ORANGE SOLUTION
METHYL ORANGE INDICATOR SOLN
METHYL ORANGE MIXED INDICATOR
METHYL ORANGE A.C.S. REAGENT
METHYL ORANGE (C.I. no 13025 )
Methyl Orange, certified, pure
methyl orange sodium salt, acs
c.i.acidorange52(methylorange)
Methyl Orange, indicator, pure
Methyl orange, Practical grade
Methyl Orange,pure,conform to ACS
METHYL ORANGE - BROMOCRESOL GREEN
Methyl Orange, 0.1% w/v aq. soln.
METHYL ORANGE SOLUTION I07 100 ML
Methyl Orange, conform to ACS, pure
METHYL ORANGE SOLUTION 0.05% AQUEOUS
Methyl Orange, indicator, pure 100GR
Methyl Orange, indicator, pure 500GR
METHYL ORANGE (C.I.13025) INDICATOR ACS
METHYL ORANGE INDICATOR, REAG. PH. EUR.
sodiump-dimethylaminoazobenzenesulfonate
METHYL ORANGE SOLUTION 0.1% INDICATOR PH
Methyl Orange, conforM to ACS, pure 10GR
Methyl Orange, conforM to ACS, pure 25GR
Methyl Orange mixed indicator solution
p-DiMethyl-aMinoazobenzene sodiuM sulfonate
METHYL ORANGE, 0.1 WT. % SOLUTION IN WAT ER
Methyl Orange (0.1% in Water) [for Titration]
Methyl Orange sodium salt, 0.1% w/v aq. soln.
Methyl orange - bromocresol green solution
SODIUM 4-(DIMETHYLAMINO)AZOBENZENE-4'-SULFONATE
Methyl Orange,pure,high purity biological stain
Methyl Orange, high purity biological stain, pure
P-DIMETHYLAMINOAZOBENZENESULFONIC ACID SODIUM SALT
Sodium 4-(4-dimethylaminophenylazo)benzenesulphonate
4-dimethylaminoazobenzene-4’-sulphonicacidsodiumsalt
4-DIMETHYLAMINOAZOBENZENE-4-SULFONIC ACID SODIUM SALT
Methyl orange (C.I. 13025) indicator ACS,Reag. Ph Eur
4-((4-(dimethylamino)phenyl)azo)-benzenesulfonicacisodiumsalt
4-[[4-(dimethylamino)phenyl]azo]-benzenesulfonicacisodiumsalt
p-((p-(dimethylamino)phenyl)azo)-benzenesulfonicacisodiumsalt
4-[P-(DIMETHYLAMINO)PHENYLAZO]BENZENESULFONIC ACID SODIUM SALT
4-[4-(DIMETHYLAMINO)PHENYLAZO]BENZENESULFONIC ACID, SODIUM SALT
Benzenesulfonicacid,4-[[4-(dimethylamino)phenyl]azo]-,sodiumsalt
sodiuM (E)-4-((4-(diMethylaMino)phenyl)diazenyl)benzenesulfonate
P-[[P-(DIMETHYLAMINO)PHENYL]AZO]BENZENESULFONIC ACID, SODIUM SALT
IDRANAL 100 (IDRANAL III SOLUTION) FOR W ATER HARDNESS DETERMINATION
Sodium 4-[(E)-2-[4-(dimethylamino)phenyl]-diazen-1-yl]benzene-1-sulfonate
Methyl Orange, 0.1 Percent (w/v) Aqueous Indicator Solution, USP Test Solution
4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Helianthin, Orange III
C.I. 13025
Helianthise
MO
4-Dimethylaminoazobenzene-4-sulfonic acid, sodium salt
4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt
Acid Orange 52
Helianthin
Orange III | [EINECS(EC#)]
208-925-3 | [Molecular Formula]
C14H14N3NaO3S | [MDL Number]
MFCD00007502 | [MOL File]
547-58-0.mol | [Molecular Weight]
327.33 |
| Chemical Properties | Back Directory | [Appearance]
orange-yellow powder | [Melting point ]
300 °C
| [density ]
0.987 g/mL at 25 °C
| [Fp ]
37 °C
| [storage temp. ]
Store at RT. | [solubility ]
5g/l | [Colour Index ]
13025 | [form ]
Powder/Solid | [pka]
3.4(at 25℃) | [color ]
Yellow-Orange | [Specific Gravity]
0.987 | [Odor]
Odorless | [PH]
6.5 (5g/l, H2O, 20℃) | [PH Range]
3.1(Red)-4.4(Orange) | [Stability:]
Stable. Incompatible with strong oxidizing agents. | [Water Solubility ]
Soluble in ethanol. Partially soluble in hot water. Slightly soluble in cold water and pyrimidine. Insoluble in ether and alcohol. | [λmax]
507nm, 522nm, 464nm | [Merck ]
14,6105 | [BRN ]
4732884 | [Biological Applications]
Detecting microorganisms; treating dermatological diseases,vaginal affections; dental materials; wound dressing materials | [Major Application]
Liquid crystals, thin films, sensors, sol-gel matrix, waveguides, host-guest chemistry, display device, corrosion inhibitor, glass coatings, paints, wound dressing materials, pharmaceuticals, dental materials, measuring nucleic acid | [CAS DataBase Reference]
547-58-0 | [EPA Substance Registry System]
Benzenesulfonic acid, 4-[[4-(dimethylamino)phenyl] azo]-, sodium salt(547-58-0) |
| Hazard Information | Back Directory | [Chemical Properties]
orange-yellow powder | [General Description]
Orange powder. | [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. | [Uses]
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. | [Definition]
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. | [Definition]
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. | [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.
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Light Fastness
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Soaping
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Persperation Fastness
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Oxygen bleaching
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Fastness to seawater
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Fading
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Fading
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Fading
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| [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.] |
| Questions And Answer | Back Directory | [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
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