Thursday, 16 May 2013

5.27 describe the manufacture of sulfuric acid by the contact process, including the essential conditions

(stage 1) S + O2 > SO2 
(stage 2) SO2 + O > SO3
(satge 3) SO3 + H2O > H2SO4
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 i) a temperature of about 450C

ii) a pressure of about 2 atmospheres

iii) a vanadium(V) oxide catalyst (in stage 2)

Very helpful source:
http://namedorganicreactions.co.uk/Sulphuric.pdf
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10 comments:

  1. Unknown2 June 2014 at 05:13

    Stage 3 is wrong in this, if you just add water to the sulfur trioxide you get an uncontrollable mist of H2SO4.

    What you actually do is absorb the SO3 in sulfuric acid to create oleum (H2S2O7
    Then you add water:

    H2S2O7 + H20 = 2H2SO4

    ReplyDelete
  2. Unknown8 April 2015 at 21:41

    It's not necessary for you to know that in-depth for IGCSE

    ReplyDelete
    Replies
    1. Unknown8 May 2015 at 00:39

      This comment has been removed by the author.

      Delete
  3. Anonymous13 May 2015 at 05:21

    S + O2 (not 2O) in stage 1. Oxygen is diatomic x

    ReplyDelete
  4. Unknown11 April 2016 at 01:31

    This comment has been removed by a blog administrator.

    ReplyDelete
  5. Unknown24 December 2016 at 07:35

    The second equation is wrong, it should be 2SO2 + O2 > 2SO3

    ReplyDelete
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