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Homework Help: Left, Right or Double headed arrow?

  1. Feb 28, 2009 #1
    1. The problem statement, all variables and given/known data

    How do you know when to use Left, Right or Double headed arrows for Acid-Base equilibrium?

    2. Relevant equations

    How can you determine from a reaction if it "goes to completion" (right) or doesn't react at all (left) or is at equilibrium just by looking at it?

    3. The attempt at a solution

    This is just a general question. =)

    Thanks!
    -Megan Rose
     
  2. jcsd
  3. Feb 28, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    You have to know which acids and bases are strong and which are weak. Most reactions involving strong acids/bases go to completion so you can use one headed arrows pointing in teh direction where water is one of the products.

    But:

    1. to some extent you can always use double headed arrow, as almost every possible reaction goes in both directions.

    2. there will be always a grey area where every second chemist will have a different opinin on th earrow type that shoukd be used.

    Bottom line is: don't put too much attention to the arrow shape :wink:
     
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