Exercise 18.38 with feedback Balance each of the following redox reactions occur

Question

Exercise 18.38 with feedback

Balance each of the following redox reactions occurring in acidic aqueous solution.

Part A

Ni(s)+Cd2+(aq) Ni2+(aq)+Cd(s)

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part B

Zn(s)+Na+(aq) Zn2+(aq)+Na(s)

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part C

Cl(aq)+NO3(aq) NO(g)+Cl2(g)

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Exercise 18.38 with feedback

Balance each of the following redox reactions occurring in acidic aqueous solution.

You may want to reference( pages 862 - 865) section 18.2 while completing this problem.

Explanation / Answer

Part A

Ni(s)-à Ni2+ (aq)+ 2e-

Cd2+(aq) +2e- -- > Cd(s)

=======================

Ni(s)+Cd2+(aq) Ni2+(aq)+Cd(s)

Part B

2Na+(aq) + 2e- ==> 2Na(s)
Zn(s) ==> Zn2+(aq) + 2e-
=============================
2Na+(aq) + Zn(s) ==> 2Na(s) + Zn2+(aq)

Part C

Cl(aq)+NO3(aq) NO(g)+Cl2(g)

2Cl^- --> Cl2 + 2e^-

2NO3^- + 8H^+ +6e^- --> 2NO + 4H2O

3(2Cl^- --> Cl2 + 2e^-) = 6Cl^- --> 3Cl2 + 6e^-
2NO3^- + 8H^+ +6e^- --> 2NO + 4H2O

add both half reactions to get the net equation:

6Cl^-(aq) + 2NO3^-(aq) + 8H^+(aq) --> 2NO(g) + 3Cl2(g) + 4H2O(l)

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