Homework Help: Chemistry Cell notations

Posted by Confused on Thursday, December 2, 2010 at 10:42pm.

Enter the balanced chemical equation including states that describes the electrochemical cell that is represented by the cell notation as shown.

Pt(s) l H2O(l) l O2(g) l H+(aq) ll H+(aq), Cr2O72-(aq), Cr3+(aq) l Pt(s)

Chemistry Cell notations - DrBob222, Thursday, December 2, 2010 at 10:56pm
2H2O ==> O2 + 4H^+ 4e
H^+ + Cr2O7^-2 + 6e ==> 2Cr^+3 + 7H2O

You can add the phases. Check my work.
Chemistry Cell notations - Confused, Friday, December 3, 2010 at 2:31am
Okay so the problem I had with this is like...I did't understand that when it was written say on the left of the double vertical line how you know

H2O --> O2 + H+

will it always be written in the order of how you write the reaction? or like could you also right it like

O2 + H+ --> h2o

or basically how do you know which species (H2), O2, and H+ are on the reactant/product side?
Chemistry Cell notations - Confused, Friday, December 3, 2010 at 2:34am
also shouldn't it be the coefficient of H^+ in the second equation be 14?

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