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bromine absorbtion tower

• Message 1. 

  Posted by naashells (U14777471) on Saturday, 23rd February 2013

  what change wou,d you expect to see when bromine vapour enters the absorbtion tower?
  online it says change in the pressure
  but why?
  thansk )

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• Message 2

  , in reply to message 1.

  Posted by The Bitesize Science Teacher (U14392404) on Saturday, 23rd February 2013

  A note everyone - this is A Level Chemistry so don't panic that you haven't covered it in your GCSE lessons!
  
  The bromine vapour reacts with sodium carbonate (an alkali) in the absorption tower and disproportionates to bromide and bromate(V) ions in solution. As the vapour has in effect disappeared, the pressure will go down. As bromine vapour is orange-brown, I'd also expect to see the colour change to colourless.
  
  Later on in the process, the bromide and bromate(V) ions are reacted with sulfuric acid to form bromine and steam (and sulfate ions).

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  Posted by naashells (U14777471) on Sunday, 24th February 2013

  ok thank you

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