Complete and balance the following equations, and identify the oxidizing and red

Question

Complete and balance the following equations, and identify the oxidizing and reducing agents. a. S(s) + HNO_3 (aq) rightarrow H_2 SO_3 (aq) + N_2 O (g) (acidic solution) b. NO_2^- (aq) + Al(s) rightarrow NH_4^+ (aq) + AIO_1^- (aq) (basic solution) Calculate the standard emf for the following reactions (use data in Appendix E a. H_2 (g) + F_2 (g) rightarrow 2H^- (aq) + 2F^- (aq) b. Ca(s) + Cu^2+ (aq) rightarrow Ca^2+ (aq) + Cu(s) Balance the following reactions, calculate E_cell degree and state whether the reaction is spontaneous a. Co(s) + H^+ (aq) rightarrow Co^2+ 9aq) + h_2 (g) b. Mn^&2+ (aq) + Br_2 (l) rightarrow MnO_4^- (aq) + Br^- (aq)

Explanation / Answer

Q1.

acidic

split half cells

S = SO3-2

NO3- = N2O

balance N

S = SO3-2

2NO3- = N2O

balance O

3H2O + S = SO3-2

2NO3- = N2O + 5H2O

balance H

3H2O + S = SO3-2 + 6H+

10H+ +2NO3- = N2O + 5H2O

balance charge

3H2O + S = SO3-2 + 6H+ +4e-

8e- + 10H+ +2NO3- = N2O + 5H2O

balance e-

6H2O + 2S = 2SO3-2 + 12H+ +8e-

8e- + 10H+ +2NO3- = N2O + 5H2O

add all

8e- + 10H+ +2NO3- + 6H2O + 2S = 2SO3-2 + 12H+ +8e- + N2O + 5H2O

cancel common terms

2NO3- + H2O + 2S = 2SO3-2 + 2H+ + N2O

this is now balanced in acidic media

b)

split

NO2- = NH4+

Al = AlO2-

balance O

NO2- = NH4+ + 2H2O

2H2O + Al = AlO2-

balance H

8H+ + NO2- = NH4+ + 2H2O

2H2O + Al = AlO2- + 4H+

balance charge

6e- + 8H+ + NO2- = NH4+ + 2H2O

2H2O + Al = AlO2- + 4H+ + 3e-

balance

6e- + 8H+ + NO2- = NH4+ + 2H2O

4H2O + 2Al = 2AlO2- + 8H+ + 6e-

add all

4H2O + 2Al + 6e- + 8H+ + NO2- = NH4+ + 2H2O + 2AlO2- + 8H+ + 6e-

cancel common terms

4H2O + 2Al + NO2- = NH4+ + 2H2O + 2AlO2-

4H2O + 2Al + NO2- = NH3 + H+ + 2H2O + 2AlO2-

add OH-

OH- + 4H2O + 2Al + NO2- = NH3 + H2O + 2H2O + 2AlO2-

cancel commont erms

OH- + H2O + 2Al + NO2- = NH3 + 2AlO2-

this is now basic balanced

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