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4 Nov 2008, 5:47 PM
| #1 (permalink) |
| Executive Member HSC: 2008 Gender: Male
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6 Oct 2009, 8:19 AM  | Simpl question about water, those damn water equations You can hide this advertisement by registering. How do I know when do I use which??H2O + e- --> 1/2H2(g) + OH- 1/2O2(g) + H2O + 2e- --> 2OH- 1/2O2(g) + 2H+ 2e- --> H2O They are these 3 i am confused about. I think the first one is cathode? thrid is anode? And what about the 2nd one? tyty |
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4 Nov 2008, 5:57 PM
| #2 (permalink) | |
| Member  HSC: 2008 Gender: Female Location: Sydney
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9 Nov 2009, 11:35 PM | Re: Simpl question about water, those damn water equations Quote:
the second one occurs at the cathode of a corrosion reaction, however when the conditions of the corrosion are acidic, then the third reaction occurs the last one is oxidation which occurs at the anode, and you write it in reverse that is my understanding, | |
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4 Nov 2008, 6:23 PM
| #4 (permalink) | |
| Member HSC: 2008 Gender: Female Location: Sydney
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9 Nov 2009, 11:35 PM | Re: Simpl question about water, those damn water equations Quote:
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4 Nov 2008, 6:25 PM
| #5 (permalink) |
| Executive Member HSC: 2008 Gender: Male
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6 Oct 2009, 8:19 AM | Re: Simpl question about water, those damn water equations I am enlightened by u, but how come ive never read this in text books? Which part is this? do u know? |
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4 Nov 2008, 6:32 PM
| #6 (permalink) |
| Member HSC: 2008 Gender: Female Location: Sydney
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9 Nov 2009, 11:35 PM | Re: Simpl question about water, those damn water equations i never really listened during the shipwrecks topic in class but ive been learning from the keep it simple science booklet and thats what it says there apparently its the reason that acidity increases corrosion, because the third reaction (which happens when conditions are acidic) occurs more readily than the second one as you can deduce from their relative positions of the table of standard potentials keep in mind with the third reaction that when it is being occuring at the cathode of acidic corrosion, then it is written as is... however in normal redox reactions when it occurs as oxidation at the anode, it is written in reverse, because it is oxidation |
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5 Nov 2008, 6:33 AM
| #7 (permalink) | |
| Junior Member HSC: 2008 Gender: Male
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7 Oct 2009, 5:24 PM | Re: Simpl question about water, those damn water equations Quote:
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5 Nov 2008, 2:25 PM
| #8 (permalink) |
| Executive Member HSC: 2008 Gender: Male
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6 Oct 2009, 8:19 AM | Re: Simpl question about water, those damn water equations well i think its just acidic corrosion, it happens when sulfate reducing bacteria produce H+ ions. Well, ask Zippora... |
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5 Nov 2008, 2:43 PM
| #9 (permalink) |
| Senior Member  HSC: 2008 Gender: Male
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24 Sep 2009, 11:00 AM | Re: Simpl question about water, those damn water equations When the pH is between 4-7 the third equation occurs. The H+ are produced by sulfate-reducing bacteria. When the pH <3 straight reduction of hydrogen to hydrogen gas occurs. |
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