1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Transferring electrons

  1. Oct 14, 2008 #1
    Hey iv been given a tutorial question that says:
    How many electrons are transferred in the following reaction?

    Fe + 2HCl -> FeCl2 + H2

    Now when you go to a redution potential table and get
    Fe2+ + 2e- -> Fe(s)
    2H+ + 2e- -> H2
    Cl2 + 2e- -> 2Cl-

    Do you have to do the reaction between the H and Cl first and then do the whole reaction or what?
    Cheers
     
  2. jcsd
  3. Oct 14, 2008 #2

    Borek

    User Avatar

    Staff: Mentor

    Forget about table, try to split the reaction into two half reactions - reduction and oxidation.
     
  4. Oct 21, 2008 #3
    If you look at the half reactions though don't both reactions have the electrons on the right hand side in order to get the right final equation, or am i missing something crucial out.
    But if Fe is oxidation Fe-Fe2+ + 2e- and Cl is reduction Cl2 + 2e- - 2Cl-, then u would have a transfer of two electrons, right?
     
  5. Oct 21, 2008 #4

    Borek

    User Avatar

    Staff: Mentor

    What you are missing is fact, that you don't start wirh Fe2+ - so you have to reverse one of the reactions.

    Fe is oxidized, that's OK.

    Write net ionic reaction, you will see what is being reduced.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Transferring electrons
Loading...