Question

Predict the half-cell reactions that occur when aqueous solutions of the following salts are electrolyzed in a cell with inert electrodes. What is the overall cell reaction in each case?

Part A anode reaction for LiBr Express your answer as a ionic equation. Identify all of the phases in your answer. 2Br−(aq)→Br2(l)+2e− Part B cathode reaction for LiBr: Express your answer as a ionic equation. Identify all of the phases in your answer. 2H2O(l)+2e−→H2(g)+2OH−(aq)

overall cell reaction for LiBr: Express your answer as a ionic equation. Identify all of the phases in your answer. Li+Br→Li++Br− SubmitMy AnswersGive Up Incorrect; Try Again; 5 attempts remaining

Part D anode reaction for CuSO4 Express your answer as a ionic equation. Identify all of the phases in your answer.

cathode reaction for CuSO4 Express your answer as a ionic equation. Identify all of the phases in your answer. SubmitMy AnswersGive Up

Part F overall cell reaction for CuSO4 Express your answer as a ioNic with phases anode reaction for Na2SO4

Cathode?

Overall?

Answer 1

Part A anode reaction for LiBr

2Br−(aq) ---> Br2(l)+ 2e−

Part B cathode reaction for LiBr:

2H2O(l)+2e− ---> H2(g)+2OH−(aq)

part C overall cell reaction for LiBr:

2Br−(aq) ---> Br2(l)+ 2e−

2H2O(l)+2e− ---> H2(g)+2OH−(aq)
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2Br−(aq)+2H2O(l) ---> Br2(l)+H2(g)+2OH−(aq)
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Part D anode reaction for CuSO4:

2H2O(l) -----> o2(g) + 4H^+(aq) + 4e-

part E cathode reaction for CuSO4:

Cu^2+(aq) + 2e- ----> Cu(s)

Part F overall cell reaction for CuSO4:

2H2O(l) -----> o2(g) + 4H^+(aq) + 4e-

( Cu^2+(aq) + 2e- ----> Cu(s) )*2
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2H2O(l)+2Cu^2+(aq) -----> o2(g) + 4H^+(aq) +2Cu(s)
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