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Removing impurities using Na2CO3

  1. May 30, 2012 #1
    1. The problem statement, all variables and given/known data

    attachment.php?attachmentid=152542&d=1338376811.png

    Why is the answer D??

    2. Relevant equations
    3. The attempt at a solution
    So I know that Na2CO3 is used to remove excess acid but surely only HBr is the acid?
     
  2. jcsd
  3. May 30, 2012 #2

    Borek

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    Staff: Mentor

    SO2 is an acid anhydride, so there would be nothing strange in the fact it reacts with a basic solution. However, there is more to it. Bromine is a strong oxidizing agent, and in the alkaline solution it can easily oxidize sulfite (known reducing agent) to something much more stable.
     
  4. May 30, 2012 #3
    but the conditions are acidic?
     
  5. May 30, 2012 #4

    Borek

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    Staff: Mentor

    During reaction, but we are talking about purification of a distilled product, don't we?
     
  6. May 30, 2012 #5
    oh so it has been seperate from acid
    and therefore the sodium carbonate is the base? right?
     
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