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In an acid solution using the half-reaction method balance the following oxidation/reduction reactions. Identify the oxidizing...

In an acid solution using the half-reaction method balance the following oxidation/reduction reactions. Identify the oxidizing agent and the reducing agent in each reaction.

a. ??(?) + ??3 - (??) → ??2+ (??) + ??(?)

b. ??2?72-(??) + ??-(??) → ??3+(??) + ??2 (?)

c. ??22+(??) + ??(?) → ?4+(??) + ???42-

d. ??2 (??) → ???3-(??) + ??-(??)

Solutions

Expert Solution

a.

              oxidation half reaction                                               reaction half reaction

Cu(s) -------> Cu^2+ (aq)                                                              NO3^- (aq) ------> NO(g)

Cu(s) -------> Cu^2+ (aq)                                                              NO3^- (aq) ------> NO(g)+2H2O(l)

Cu(s) -------> Cu^2+ (aq)                                                              NO3^- (aq)+4H^+(aq) ------> NO(g)+2H2O(l)

Cu(s) -------> Cu^2+ (aq) +2e^-                                                  NO3^- (aq)+4H^+(aq) +3e^- ------> NO(g)+2H2O(l)

                                             3Cu(s) -------> 3Cu^2+ (aq) +6e^-                                        

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

                       ----------------------------------------------------------------------------------------

                             3Cu(s) + 2NO3^- (aq) + 8H^+ (aq) -----> 3Cu^2+ (aq) + 2NO(g) + 4H2O(l)

NO3^- is oxidizing agent              Cu is reducing agent

b.

   oxidation half reaction                                                                           reduction half reaction

2Cl^- (aq) ----> Cl2(g)                                                         Cr2O7^2- (aq) ------>. 2Cr^3+ (aq)

2Cl^- (aq) ----> Cl2(g)                                                       Cr2O7^2- (aq) ------>. 2Cr^3+ (aq)+7H2O(l)

2Cl^- (aq) ----> Cl2(g)                                                     Cr2O7^2- (aq)+14H^+(aq) ------> 2Cr^3+ (aq)+7H2O(l)

2Cl^- (aq) ----> Cl2(g) +2e^-                                         Cr2O7^2- (aq)+14H^+(aq)+6e^- ---->. 2Cr^3+ (aq)+7H2O(l)

                                   6Cl^- (aq) ----.> 3Cl2(g) +6e^-                                     

   Cr2O7^2- (aq)+14H^+(aq)+6e^- ------. 2Cr^3+ (aq)+7H2O(l)

                ---------------------------------------------------------------------------------------

                      6Cl^- (aq) + Cr2O7^2- (aq) +14H^+(aq) ------> 3Cl2(g) + 2Cr^3+ (aq) + 7H2O(l)

Cr2O7^2- is oxidizing agent             Cl^- is reducing agent

c.

oxidation half reaction                                                                           reduction half reaction

Te(s) -----> TeO4^2- (aq)                                                     UO2^2+(aq) -----------> U^4+ (aq)

Te(s) +4H2O(l)-----> TeO4^2- (aq)                                        UO2^2+(aq) -----------> U^4+ (aq)+2H2O(l)

Te(s) +4H2O(l)-----> TeO4^2- (aq)+8H^+(aq)                       UO2^2+(aq) +4H^+(aq)-------> U^4+ (aq)+2H2O(l)

Te(s) +4H2O(l)-----> TeO4^2- (aq)+8H^+(aq)+6e^-             UO2^2+(aq) +4H^+(aq)+2e^- -------> U^4+ (aq)+2H2O(l)

                      Te(s) +4H2O(l)-----> TeO4^2- (aq)+8H^+(aq)+6e^-       

        3UO2^2+(aq) +12H^+(aq)+6e^- -------> 3U^4+ (aq)+6H2O(l)

----------------------------------------------------------------------------------------------------

                        Te(s) +3UO2^2+ (aq) +4H^+(aq) -------> TeO4^2- (aq)+3U^4+ (aq)+2H2O(l)

UO2^2+ is oxidizing agent         Te is reducing agent

d.

oxidation half reaction                                                                           reduction half reaction

Cl2(g) ----> 2ClO3^-(aq)                                                                       Cl2(g) ----> 2Cl^-(aq)

Cl2(g) +6H2O(l)----> 2ClO3^-(aq)                                                        Cl2(g) ----> 2Cl^-(aq)

Cl2(g) +6H2O(l)----> 2ClO3^-(aq) +12H^+(aq)                                Cl2(g) ----> 2Cl^-(aq)

Cl2(g) +6H2O(l)----> 2ClO3^-(aq) +12H^+(aq) +10e^-                     Cl2(g) +2e^- ----> 2Cl^-(aq)

                                         Cl2(g) +6H2O(l)----> 2ClO3^-(aq) +12H^+(aq) +10e^-                

    5Cl2(g) +10e^- ----> 10Cl^-(aq)

                                ---------------------------------------------------------------------------

                                  6Cl2(g) +6H2O(l)------> 2ClO3^- (aq) + 10Cl^- (aq) + 12H^+(aq)

Cl2 is oxidizing agent               Cl2 is reducing agent

queen_honey_blossom answered 2 years ago
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