Predict the anode, cathode, and overall cell reactions when an aqueous solution

Question

Predict the anode, cathode, and overall cell reactions when an aqueous solution of each of the following salts is electrolyzed in a cell having inert electrodes.

Ag2SO4

Anode:

2H2O(l)?O2(g)+4H+(aq)+4e?

Cathode:

2H2O(l)?O2(g)+4H+(aq)+4e?

Overall:

Ca(OH)2

Anode:

4Ca2+(aq)+2OH?(aq)?CaO(s)+H2O(l)

Cathode:

Overall:

2H2O(l)?2H2(g)+O2(g)

KI

Anode:

Cathode:

H2(g)+2OH?(aq)?2H2O(l)+2e?

Overall:

SO2?4(aq)+OH?(aq)?SO3(g)+H2O(l) O2(g)+4H+(aq)+4e??2H2O(l) Ag+(aq)+e??Ag(s)

2H2O(l)?O2(g)+4H+(aq)+4e?

Cathode:

Ag+(aq)+OH?(aq)?Ag(OH)(s) 4Ag(s)?4Ag+(aq)+4e? 4Ag+(aq)+4e??4Ag(s)

2H2O(l)?O2(g)+4H+(aq)+4e?

Overall:

SO3(g)+2Ag(s)?2Ag+(aq)+SO2?4(aq) 4Ag+(aq)+2H2O(l)?O2(g)+4H+(aq)+4Ag(s) 2Ag+(aq)+SO2?4(aq)?SO3(g)+2Ag(s) 2Ag+(aq)+H2O(l)?O2(g)+2H+(aq)+2Ag(s)

Explanation / Answer

1) Ag2SO4

Anode : 2H2O(l)---> O2(g)+4H+(aq)+4e-

Cathode : 4Ag+(aq)+4e- ---> 4Ag(s)

Overall : 4Ag+(aq)+2H2O(l)----> O2(g)+4H+(aq)+4Ag(s)

2) Ca(OH)2

Anode : 4OH-(aq) ---> O2(g)+2H2O(l)+4e-

Cathode : 4H2O(l)+4e- ---> 2H2(g)+4OH-(aq)

Overall : 2H2O(l)---> 2H2(g)+O2(g)

3) KI

Anode : 2I-(aq) --->I2(s)+2e-

Cathode : 2H2O(l)+2e- ---> H2(g)+2OH-(aq)

Overall : 2I-(aq)+2H2O(l) ----> I2(s)+H2(g)+2OH-(aq)

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