Balancing Redox Equations: Practice Problems 1. Complete and balance the followi

Question

Balancing Redox Equations: Practice Problems 1. Complete and balance the following equations using the halfreaction method. Be sure to show the separate equations and to illustrate the steps clearly a) Mino (aa) Hsos (ang) Mn (ang) so? (aq) (acidic solution) b) Zn(s) (acidic solution) 2). Identify the oxidation numbers for the following. Mn in Mno4 S in HSO3 (note: His+1) Mn in Mn Sin So Zn in Zn(s) Nin NO3 Zn in Zn N in N20 3). For the equation in la, identify the following. oxidizing agent reducing agent 4). For the equation in lb, identify the following oxidizing agent reducing agent

Explanation / Answer

Q1.

a) split reactions

MnO4- = Mn+2

HSO3- = SO4-2

balance O

MnO4- = Mn+2 + 4H2O

H2O + HSO3- = SO4-2

balance H+

8H+ + MnO4- = Mn+2 + 4H2O

H2O + HSO3- = SO4-2 + 3H+

balance charges

5e- + 8H+ + MnO4- = Mn+2 + 4H2O

H2O + HSO3- = SO4-2 + 3H+ + 2e-

balanc e-

10e- + 16H+ + 2MnO4- = 2Mn+2 + 8H2O

5H2O + 5HSO3- = 5SO4-2 + 15H+ + 10e-

add all

5H2O + 5HSO3- + 10e- + 16H+ + 2MnO4- = 2Mn+2 + 8H2O +5SO4-2 + 15H+ + 10e-

cancel common terms

5HSO3- + 6H+ + 2MnO4- = 2Mn+2 + 3H2O +5SO4-2

now

b)

Zn(s) = Zn2+

NO3- = N2O

blance N

Zn(s) = Zn2+

2NO3- = N2O

balance O

Zn(s) = Zn2+

2NO3- = N2O + 5H2O

balance H+

Zn(s) = Zn2+

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

balance charges

Zn(s) = Zn2+ +2e-

9e- + 10H+ + 2NO3- = N2O + 5H2O

balance e-

9Zn(s) = 9Zn2+ + 18e-

18e- + 20H+ + 4NO3- = 2N2O + 10H2O

add all

9Zn(s) + 18e- + 20H+ + 4NO3- = 2N2O + 10H2O + 9Zn2+ + 18e-

cancel common terms

9Zn(s) + 20H+ + 4NO3- = 2N2O + 10H2O + 9Zn2+

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