1. Limited time only! Sign up for a free 30min personal 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!

Ionic/redox reactions need checking

  1. May 7, 2012 #1
    ionic/redox reactions need checking :)

    Hi again, I had a number of questions that im not quite sure about. Ive asked peers, although they seem confused too.
    1. When you have NaOH + Fe2O3. xH2O would the sodium displace the iron, from rust, to form NaO3+ H2O?
    2. Oxidisation-reduction reaction for iron rusting. Heres what I got, although im not too sure its correct:
    4 Fe(s) + 6 H2O(l) + 3 O2(g) = 4 Fe3+(aq) + 12 OH-(aq)
    Fe2+(aq) + 2OH-(aq) = Fe(OH)2(s)
    Fe(OH)2(s) + O2(g) = Fe(OH)3(s)
    Fe(OH)3(s) = (dehydrates) Fe2O3.xH2O(s) + H2O(l)

    And again: iron reacting with citric acid
    Fe¬(s) = Fe2+ (s) + 2e-
    C6H8O7 (aq) = C6H6O72- (aq) + 2 H+(g)
    Fe2+ (s) + C6H6O72- (aq) = FeC6H6O7 (s)
    2e- + 2 H+ = H2 (g)

    And: iron reacting with acetic acid
    Fe(s) = Fe2+ (aq) + 2e-
    2 CH3COOH(aq) = (CH3COO)2- (aq) + 2 H+(g)
    Fe2+ (s) + (CH3COO)-2 (aq) = Fe (CH3COO)2 (s)
    2e- + H+2 = H2

    3. And: copper reacting with acetic acid
    Cu(s) = Cu2+ (s) +2e-
    2 CH3COOH(aq) = (CH3COO)2- (aq) + 2 H+(g)
    Cu2+ (s) + (CH3COO)-2 (aq) = Cu (CH3COO)2 (s)
    2e- + 2 H+ = H2 (g)
    4. And copper reacting with citric acid:
    Cu(s) = Cu2+ (s) +2e-
    2 C6H8O7 (aq) = (C6H5O7)2-(aq) + 6 H+(g)
    3 Cu2+ (s) + 2 (C6H5O7)2-(aq) = Cu3(C6H5O7)2 (s)
    2e- + 2 H+ = H2 (g)
    5. and if i added salt crystals to water, and put an iron nail in it, would the salt draw away the ions from the iron in the water? (thus slowing down the corrosion of iron)

    Sorry for all the trouble!
     
    Last edited by a moderator: May 7, 2012
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted



Similar Discussions: Ionic/redox reactions need checking
  1. Redox reaction (Replies: 1)

  2. Redox Reactions (Replies: 4)

Loading...