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Methyl orange is an intensely colored compound used in dyeing and printing textiles. It is also known as C.I. Acid Orange 52, C.I. 13025, helianthine B, ... Chemists use methyl orange as an indicator in the titration of weak bases with strong acids. It changes from red (at pH 3.1) to orange-yellow (at pH 4.4):
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antoine.frostburg.edu/chem/senese/101/acidbase/faq/meth...
antoine.frostburg.edu/chem/senese/101/acidbase/faq/methyl-orange.shtml
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Describes how indicators work, and their use in various acid-base titrations ... You can see that neither indicator is any use. Phenolphthalein will have finished changing well before the equivalence point, and methyl orange falls off the graph altogether.
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www.chemguide.co.uk/physical/acidbaseeqia/indicators.ht...
www.chemguide.co.uk/physical/acidbaseeqia/indicators.html
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A tutuorial on indicators suitable for high school students ... methyl orange indicator red red red red yellow yellow yellow yellow yellow yellow yellow yellow yellow yellow yellow 3.1 - 4.4 ... A suitable indicator would be methyl orange (pH range 3.1 - 4.4) or methyl red (pH range 4.4 - 6.0)
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www.ausetute.com.au/indicata.html
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Methyl Orange Indicator, Laboratory Grade, 25 g ... Home > Search Term: indicator > Methyl Orange, Indicator ... Methyl Orange, Sodium Salt, 0.05% Aqueous, Laboratory Grade, 500 mL...
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www.carolina.com/product/methyl+orange+indicator,+labor...
www.carolina.com/product/methyl+orange+indicator,+laboratory+grade,+25+g.do?keyword=indicator&sortby=bestMatches
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Methyl Orange indicator is made by dissolving .01 g of the powder into 100 ml of DI water. This gives and indicator for a pH range of 3.2-4.4 and goes from Red to Yellow.
http://wiki.answers.com/Q/How_to_make_Methyl_Orange_Ind...
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The pH curve for the strong acid - weak base titration shows that phenolphthalein is not a suitable indicator but methyl orange is fine. For the titration of weak acid - strong base, phenolphthalein, but not methyl orange, is a suitable indicator.
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www.avogadro.co.uk/chemeqm/acidbase/titration/phcurves....
www.avogadro.co.uk/chemeqm/acidbase/titration/phcurves.htm
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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.
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www.chemistry-react.org/go/Faq/Faq_3745.html
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A web site for students studying advanced chemistry courses in the UK ... But if we add alkali (such as NaOH) to methyl orange, this will react with the H+ ions and then more HIn will ionise so as to replace them. So more In– will be formed and eventually the indicator will appear yellow.
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www.chemistry-react.org/go/Faq/Faq_8219.html
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Aim To calculate the solubility of Calcium Hydroxide (Ca(OH)2) by titration with Hydrochloric Acid (HCl) and using screened methyl orange indicator. Coursework by GCSE and A level students ... Words: | Submitted: Tue May 02 2006 ... See this essay or coursework document in full right now...
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www.studentcentral.co.uk/aim_calculate_solubility_calci...
www.studentcentral.co.uk/aim_calculate_solubility_calcium_hydroxide_ca_oh_b_35547/
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