The Color of Methyl Orange in Strong Acidic Solution is ________

  • Red
  • Yellow
  • Blue
  • Colorless
Monis Rasool Professor Asked on 6th May 2015 in Chemistry.
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    RED
    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, Orange III, Gold orange, and Tropaeolin D [1].

    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)

    RE: The Color of Methyl Orange in Strong Acidic Solution is ________

    pH-related color changes result from changes in the way electrons are confined in a molecule when hydrogen ions are attached or detached. Here is the structure of methyl orange in acidic solution

    RE: The Color of Methyl Orange in Strong Acidic Solution is ________

    How is methyl orange made?

    Methyl orange is synthesized by reaction of sulfanilic acid, sodium nitrite, and dimethylaniline. First, sulfanilic acid is dissolved in dilute aqueous acid. Sodium nitrite is added to produce adiazonium salt

    This reaction is called diazotization and it is extremely useful in organic synthesis. The nitrous acid provides NO+ which replaces a hydrogen on the -NH3+ group to produce -NH2NO+ and water; a second water is eliminated to produce the -N2+ group.

    The diazonium salt is then coupled with dimethylaniline. The coupling takes place in the opposite (“para”) position from the -N(CH3)2 group:

     

    Harsh Vardhan Professor Answered on 7th May 2015.
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