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Topic: Methyl orange

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	General Chemistry Online: FAQ: Acids and bases: What is methyl orange? How is it made? (Site not responding. Last check: 2007-11-03)
		Methyl orange is an intensely colored compound used in dyeing and printing textiles.
		In the basic form of methyl orange, a hydrogen ion is lost from the -NN- bridge between the rings, and the electrons formerly used to bind the hydrogen neutralize the positive charge on the terminal nitrogen, so that it is no longer able to pi-bond.
		Methyl orange is synthesized by reaction of sulfanilic acid, sodium nitrite, and dimethylaniline.
	antoine.frostburg.edu /chem/senese/101/acidbase/faq/methyl-orange.shtml (368 words)

	acid-base indicators
		Methyl orange is one of the indicators commonly used in titrations.
		In the methyl orange case, the half-way stage where the mixture of red and yellow produces an orange colour happens at pH 3.7 - nowhere near neutral.
		The methyl orange changes colour at exactly the pH of the equivalence point of the second stage of the reaction.
	www.chemguide.co.uk /physical/acidbaseeqia/indicators.html (1440 words)

	Methyl red - Wikipedia, the free encyclopedia
		Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between.
		In microbiology, methyl red is used in the Methyl Red (MR) Test, used to identify bacteria producing stable acids by mechanisms of mixed acid fermentation of glucose.
		Methyl red is an IARC group 3 carcinogen: the evidence of its carcinogenity is inadequate.
	en.wikipedia.org /wiki/Methyl_red (176 words)

	9. SodaAsh-Analytical Procedures
		If modified methyl orange indicator is used, titrate to a gray end point.
		•Methyl Orange Indicator — Dissolve 0.1 g of methyl orange in 100 mL of water.
		•Methyl Orange Indicator, Modified — Dissolve 0.1 g of methyl orange and 0.14 g of xylene cyanole FF dye, technical grade, in 100 mL of water.
	www.genchem.com /SABrochure/SodaAshCh9.html (2743 words)

	Methyl orange - Wikipedia, the free encyclopedia
		Methyl Orange is a pH indicator frequently used in titrations.
		Unlike universal indicator, methyl orange does not have a full spectrum of colour change, but has a sharper end point.
		In a solution becoming less acidic, methyl orange moves from red to orange and finally to yellow with the reverse occurring for a solution increasing in acidity.
	en.wikipedia.org /wiki/Methyl_orange (200 words)

	Methyl Orange synthesis (Site not responding. Last check: 2007-11-03)
		Methyl orange is an example of an azo dye, though it is not commerically useful for colouring clothing because it does not bind to most varieties of cloth strongly enough to prevent washing it out when the clothing is laundered.
		Nevertheless, be careful to avoid getting any of the methyl orange from this experiment on anything, as dyeing action can be quite strong.
		Methyl orange separates as an intensely coloured solid.
	www.pittstate.edu /chem/courses/chem326/methorange.html (400 words)

	mixed ind
		If sodium carbonate is titrated with hydrochloric acid using methyl orange as the indicator, the titre is twice what it is if phenolphthalein is used as the indicator.
		Methyl orange changes at about pH 3 – 4; this corresponds to the complete neutralisation of sodium carbonate with two moles of hydrochloric acid:
		Addition of methyl orange to this mixture and further titration gives the volume of acid corresponding to half the sodium carbonate.
	www.rod.beavon.clara.net /mixedind.htm (350 words)

	Kinetics: The Reaction of Sn(II) with Methyl Orange
		The indicator, methyl orange, has a strong absorbance in the visible region of the spectrum that we will use to monitor its disappearance.
		On a separate sheet, print the spectrum of methyl orange in 1.2 M acid.
		Solutions containing only methyl orange and acid (no tin) should be poured into the beaker provided in the hood.
	www.wpi.edu /Academics/Depts/Chemistry/Courses/General/kinmethylorange.html (1493 words)

	Kinetics: The Reaction of Sn(II) with Methyl Orange
		Develop a procedure for the preparation of 10 mL of 0.001 M methyl orange indicator in water containing 1.0 M HCl.
		Transfer 0.5 mL of your methyl orange solution and 1.5 mL of 1.2 M HCl to the cell, and record an absorbance-wavelength scan.
		Using a 2-mL graduated pipet and a syringe pipet pump, transfer 0.50 mL of methyl orange solution to the spectrometer cell.
	wpi.edu /Academics/Depts/Chemistry/Courses/General/kinmethylorange.html (1493 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The purpose of this lab is to learn to diazotize sulfanilic acid and then with that, synthesize the azo dye, methyl orange, and use it to dye a multifiber fabric.
		Finally, we hypothesize that dyeing a multifiber fabric with the methyl orange will dye the fabric to varying degrees.
		We hypothesize that the polar methyl orange dye will bind more strongly to fabric types with many polar sites such as wool and silk and less strongly with fabric with fewer number of polar groups such as dacron and orlon.
	www.angelfire.com /hi4/jhyphi (170 words)

	Methyl Orange Alkalinity
		Methyl Orange Alkalinity : A measure of the total alkalinity in a water sample in which the color of methyl orange reflects the change in level.
		Methyl orange alkalinity is expressed as milligrams per liter equivalent
		M1, the methyl orange alkalinity of the filtrate, reported as the number of
	www.mongabay.com /reference/environment/Methyl_Orange_Alkalinity.html (125 words)

	ACSi 47-1 2000 (Site not responding. Last check: 2007-11-03)
		It is of great interest to pharmaceutical technologists to be able to predict interactions between particles in mixtures in order to predict their behaviour during technological processes and to control the pharmacokinetic and pharmacodynamic properties of the resulting dosage forms.
		As expected, the mixture prepared with mortar and pestle in mass proportion 1:1 was slightly coloured since Mg stearate particles (white) are covering the methyl orange.
		FT IR measurements for physical mixtures of Mg stearate and methyl orange in different proportions substantiate the spreading coefficient calculation.
	acta.chem-soc.si /49/49-2-357.html (198 words)

	ARS \| Publication request: DEVELOPMENT OF A VALENCIA ORANGE PECTIN METHYL-ESTERASE FOR GENERATING NOVEL PECTIN PRODUCTS (Site not responding. Last check: 2007-11-03)
		We have determined the major PME purified from Valencia orange peel to be a salt-independent isoenzyme, which has properties that may be advantageous in enzymatic modification of pectin and pectic materials.
		Furthermore, the orange peel PME available in a commercial enzyme preparation was demonstrated to be this same isoenzyme, providing a convenient and standardized source of the enzyme for other investigators.
		Details of the purification and characterization of the salt-independent PME are presented as well as results demonstrating a block-wise mode of action.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=127450 (516 words)

	General Chemical Industrial Products
		Titrate with standard 1N sulfuric acid solution from a 100-mL buret to the pink-color end point of methyl orange indicator.
		• Methyl Orange Indicator — Dissolve 0.1 g of methyl orange in 100 mL of water.
		• Methyl Orange Indicator, Modified — Dissolve 0.1 g of methyl orange and 0.14 g of xylene cyanole FF dye, technical grade, in 100 mL of water.
	www.genchem.com /analytical-procedures.asp (2745 words)

	Nuffield Advanced Chemistry - What colour does screened methyl orange indicator turn when in 1) alkali 2) acid and 3) ...
		Screened methyl orange is ordinary methyl orange to which a blue dye, xylene cyanole, has been added.
		The idea is to shift the colours into another part of the spectrum to tackle the problem some people have with partial colour-blindness affecting their perception of red and yellow.
		The acid colour becomes purple, the alkali colour becomes green, and the equivalence colour is a sort of muddy grey colour in between (this is not neutral because the pKa of methyl orange is 3.7).
	www.chemistry-react.org /go/Faq/Faq_3745.html (232 words)

	Article
		Abstract: Three new methods based on titrimetric and spectrophotometric techniques are described for the determination of felodipine (FLD) in the bulk drug and in tablets using a bromate–bromide mixture and two dyes, Methyl Orange and Indigo Carmine.
		In the titrimetric method (method A), the drug solution was treated with a measured excess of the bromate–bromide mixture in acid medium and after the reaction was judged to be complete, the unreacted bromine was determined iodometrically.
		The two spectrophotometricmethods are based on the bromination of the drug with a known excess of the bromate–bromide mixture under acidic conditions followed by the estimation of the surplus bromine by reaction with either Methyl Orange (Method B) or Indigo Carmine (Method C) and measuring the absorbance at 520 nm or 610 nm, respectively.
	dx.doi.org /10.2298/JSC0507969B (256 words)

	Diazonium Coupling Reaction
		This compound was once used as a food coloring agent but has been declared a suspect carcinogen by the Food and Drug Administration.
		For example, Methyl Red, prepared in this experiment, Methyl Orange and Congo Red are well-known acid-base indicators.
		Rinse the reaction flask with 0.5 mL of water and use this rinse to wash the crystals.
	www.owlnet.rice.edu /~chem215/MethylRed.html (1216 words)

	Chemical Safety Data: Methyl orange (Site not responding. Last check: 2007-11-03)
		Methyl orange is thought to be toxic if swallowed or inhaled.
		Small amounts of methyl orange solution can be flushed down a sink with a large quantity of water, unless local rules prohibit this.
		We have not verified this information, and cannot guarantee that it is up-to-date.
	ptcl.chem.ox.ac.uk /~hmc/hsci/chemicals/methyl_orange.html (128 words)

	Methyl orange total alkalinity method (Site not responding. Last check: 2007-11-03)
		Methyl sulfonyl methane including methyl orange total alkalinity method
		Methyl orange total alkalinity method plus methyl orange and UV spectroscopy
		Methyl orange total alkalinity method with poly methyl methacrylate freezing point
	methyl-orange-total-alkalinity-method.www-https.com (480 words)

	Synthesis of Methyl Orange: A Diazo Dye (Site not responding. Last check: 2007-11-03)
		Heat the mixture to boiling for 10-15 minutes to dissolve all the methyl orange.
		Prepare a dye bath by dissolving 0.5 g of methyl orange in a solution of 10 mL 15% aqueous sodium sulfate, 5 drops of concentrated sulfuric acid and 300 mL of water.
		Add sodium carbonate until the dye solution is basic.
	www.hamline.edu /~rmajerle/methylorgange/SynMeOrange.htm (377 words)

	Oilfield Glossary: Term 'methyl orange' (Site not responding. Last check: 2007-11-03)
		The indicator is yellow in solutions above pH 4.3, and red below pH 4.3.
		"M" alkalinity is the titration volume measured using the methyl orange indicator.
		Methyl orange is often replaced in test kits by bromocresol green.
	www.glossary.oilfield.slb.com /Display.cfm?Term=methyl+orange (63 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		The dissociation of methyl orange was investigated by spectrophotometry in aqueous solutions from 10 to 90 C and by quantum chemical calculations.
		Combined chemometric and thermodynamic analyses of the spectrophotometric data were used to simultaneously extract the thermodynamic stabilities and the spectrophotometric attributes of the dominant methyl orange species in solutions containing less than 20.00 mmol kg-1 perchloric acid and submicromolal concentrations of methyl orange.
		Topological analyses of the electron density also revealed the formation of a dihydrogen bond between the azo proton and an adjacent phenyl ring hydridic hydrogen which increases the stability of the azo molecules relative to the ammonium molecule.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=877590 (393 words)

	Nuffield Advanced Chemistry - What is the science behind methyl orange indicator? What colour changes occur during ...
		HIn and In have different colours: to take the example of methyl orange, HIn is red and In is yellow.
		Now, we said it was a weak acid, so it will be mostly in the HIn form and therefore coloured red.
		But if we add alkali (such as NaOH) to methyl orange, this will react with the H
	www.chemistry-react.org /go/Faq/Faq_8219.html (374 words)

	Producing Methyl Orange By Diazotization (Site not responding. Last check: 2007-11-03)
		Some common people may point out that producing methyl orange by diazotization might continue being impossible to stay informed on.
		ions can interfere with the titration by producing one liter pear shaped flask the other day for example producing That chiral methyl group really is pointing in that direction.
		Reactions of 3 5 dialkyl 4 hydroxybenzylhydrazines (where alkyl groups are t butyl and methyl In this way by diazotization of 4 (3?
	www.thefmunkys.com /producing-methyl-orange-by-diazotization.htm (98 words)

	MSDS :: Methyl Orange - Xylene Cyanole Indicator
		MSDS :: Methyl Orange - Xylene Cyanole Indicator
		Methyl Orange - Xylene Cyanole Indicator Indicator Solution
		Users of this material should satisfy themselves by independent investigation of current scientific and medical information that this material may be safely handled.
	www.sciencestuff.com /msds/C2116.html (217 words)

	Essay: Sodium Carbonate, Sulphuric Acid and Methyl Orange Assessed Practical - Coursework.Info
		Essay: Sodium Carbonate, Sulphuric Acid and Methyl Orange Assessed Practical
		Sodium Carbonate, Sulphuric Acid and Methyl Orange Assessed Practical
		Quantities of material to be used: Of Sulphuric acid 100ml; of anhydrous sodium carbonate 2.65grams; of distilled water 250ml and a Random [small] amount of Methyl Orange is also needed.
	www.coursework.info /i/8345.html (214 words)

	[No title]
		Similar dyes have not caused injury to the cornea or conjunctiva in documented exposure cases with human or rabbit eyes.
		Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
		However, methyl orange produced negative and inconclusive results in tests by the EPA Gentox Program.
	avogadro.chem.iastate.edu /MSDS/methyl_orange.htm (838 words)

	[No title]
		Exposure Limits Chemical Name ACGIH NIOSH OSHA - Final PELs Methyl orange none listed none listed none listed Disodium ethylenediaminetetraacetate dihydrate none listed none listed none listed Water none listed none listed none listed OSHA Vacated PELs: Methyl orange: No OSHA Vacated PELs are listed for this chemical.
		Respirators: A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
		In no event shall Fisher be liable for any claims, losses, or damages of any third party or for lost profits or any special, indirect, incidental, consequential or exemplary damages, howsoever arising, even if Fisher has been advised of the possibility of such damages.
	www.d.umn.edu /~psiders/courses/chem4643/msds/methylorange.txt (1242 words)

	Photoactivity and pH Sensitivity of Methyl Orange Functionalized Poly(Propyleneamine) Dendrimers
		pH and light, namely methyl orange, has been implemented in a dendrimer.
		Six generations (G0-G5) of methyl orange-functionalized poly(propyleneamine) dendrimers ("MO dendrimers") have been synthesized and characterized using
		Subsequently, the response of the MO dendrimers toward pH changes has been monitored using UV-vis spectroscopy and the photophysical properties have been investigated.
	pubs.acs.org /cgi-bin/abstract.cgi/mamobx/2002/35/i07/abs/ma011350o.html (259 words)

	Adsorption Behavior of Methyl Orange Molecules onto the Dicationic Langmuir-Blodgett Film
		-p-xylylenebis(stearyldimethylammonium chloride) (XSAC) with octadecane was investigated by using methyl orange (MO) as an adsorbate.
		As a result, high adsorbability due to ionic interaction was observed for MO molecules.
		It was found that MO molecules have the same molecular arrangements in both MO-adsorbed XSAC LB films and XSAC-MO complexed LB films and that the bilayer in the LB films took an interdigitated structure.
	pubs.acs.org /cgi-bin/abstract.cgi/langd5/1997/13/i02/abs/la960767y.html (155 words)

	Jiskha Homework Help - Features: Forum: Phenolphtalein vs Methyl Orange (check my reasonin
		Homework Help Forum: Phenolphtalein vs Methyl Orange (check my reasonin
		The equivalence point for HCl vs NaOH is 7.0 and the equivalence point for acetic acid vs NaOH is close to 9.
		The range for methyl orange you found is ok.
	www.jiskha.com /display.cgi?id=1150142384.1150147370 (185 words)

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