Acidic conditions and rusting

crammy90 · 1 Nov 2008, 11:45 AM

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anode: Fe-->Fe2+ + 2e-
cathode: 2h+ + 2e- ---> H2 0.00V
overall
Fe + 2h+ --> Fe2+ + H2
so the cathode equation here as its 0.00v means its going to go in preference of those with ve- reduction potentials. So if theses acidic conditions werent to be there i.e. no H+, what would the normal reduction reaction be? because i can see the one for rusting would be the
o2 + 2h2O + 4e- --> 4OH- 0.4V
im just wondering why if this is more likely to go why does the acidic 1 occur in the ocean
thanks

Azreil · 5 Nov 2008, 10:08 AM

Acidic one occurs in the ocean for a few reasons.

CO2 + H2O <-> H2CO3

According to Le Chatelier's principle, shifts to right as pressure is increased (ie as you go deeper).

Also anaerobic bacteria (of the desulfivibrio family) produce H+ ions in the ocean.

Hence the acidic one occurs in the ocean.

1 Nov 2008, 11:45 AM	#1 (permalink)
crammy90 Senior Member HSC: 2008 Gender: Male Join Date: Mar 2006 Posts: 281 Last Activity: 7 Jul 2009, 2:37 PM	Acidic conditions and rusting You can hide this advertisement by registering. anode: Fe-->Fe2+ + 2e- cathode: 2h+ + 2e- ---> H2 0.00V overall Fe + 2h+ --> Fe2+ + H2 so the cathode equation here as its 0.00v means its going to go in preference of those with ve- reduction potentials. So if theses acidic conditions werent to be there i.e. no H+, what would the normal reduction reaction be? because i can see the one for rusting would be the o2 + 2h2O + 4e- --> 4OH- 0.4V im just wondering why if this is more likely to go why does the acidic 1 occur in the ocean thanks

5 Nov 2008, 10:08 AM	#2 (permalink)
Azreil Senior Member HSC: 2008 Gender: Female Join Date: May 2007 Posts: 276 Last Activity: 18 Aug 2009, 9:09 PM	Re: Acidic conditions and rusting Acidic one occurs in the ocean for a few reasons. CO2 + H2O <-> H2CO3 According to Le Chatelier's principle, shifts to right as pressure is increased (ie as you go deeper). Also anaerobic bacteria (of the desulfivibrio family) produce H+ ions in the ocean. Hence the acidic one occurs in the ocean. __________________ UAI Goal: 99.55 [xDDDDD] More Realistic UAI Goal: 99.3 Actually Realistic Goal: 90.1 2007 HSC Subject: Accelerated Business Studies (94) 2008 HSC Subjects: English Advanced, English Extension 1, Chemistry, Legal Studies, Mathematics Advanced, Mathematics Extension 1. [[done!]] No, it didn't matter what I tried It's just a little hard to leave When you're going down on me I guess I stuck around so I could watch us Fight for all the wrong reasons

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