Galvanic cells: H+ vs H2SO4, and Br2(aq) vs Br2(l)

  • #1
For the reaction 12H+ + 2 IO(3-) + 10 Fe(2+) - > I2 + 6 H2O + 10 Fe(3+), the solution says that H2SO4(aq) is in the cathode. For the reaction 2 H2O2 - > O2 + 2 H2O, the solution says that H+(aq) is in the cathode and anode. When is H2SO4(aq) or H+(aq) more appropriate in the galvanic cell description?

Also, why is Br2(aq) in galvanic cells rather than Br2(l)?

Thanks.
 

Answers and Replies

  • #2
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Also, why is Br2(aq) in galvanic cells rather than Br2(l)?
Not sure why H2SO4(aq) rather than H+(aq).
Br2(aq) has electrode potential that depends on its concentration in solution. In saturated solution in equilibrium with Br2(l), the concentration of Br2(aq) is fixed by solubility and potential should be the same for Br2(aq) as for Br2(l).
 
  • #3
147
56
H2SO4 acts very much as a proton donor in redox chemistry and the redox properties of its deprotonated forms can often be neglected AFAIK.
 

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