Redox reactions require that work be shown below the reaction. Complete and bala

Question

Redox reactions require that work be shown below the reaction. Complete and balance the equations below. For at least 4 reactions must be balanced by ½ reaction method and at least 4 reactions must be balanced by the oxidation number method. . Show the work below the equation and write the balanced equation in the provided box. Even if the reaction can be solved by inspection, solve the reaction using either the ½ reaction or the oxidation number method. .Equations increase in difficulty. 1. HNO3 (aq) CuSO4s) N Cu Write balanced equation:

Explanation / Answer

First, define the “ACIDIC” solution/conditions as H+ presence and

Basic solution implies OH- once it is balanced.

Also; note that ALL species must be balanced, as well as charges

Typical steps:

1) split half redox cells

CuS = CuSO4

NO3- = NO

2) balance atoms other than O,H

no need

3) balance O by adding H2O

4H2O + CuS = CuSO4

NO3- = NO + 2H2O

4) balance H by adding H+

4H2O + CuS = CuSO4 + 8H+

4H+ + NO3- = NO + 2H2O

5) balance charge by adding e-

4H2O + CuS = CuSO4 + 8H+ + 8e-

3e- + 4H+ + NO3- = NO + 2H2O

6) balance e- by multiplying by the Greatest common divisor

12H2O + 3CuS = 3CuSO4 + 24H+ + 24e-

24e- + 32H+ + 8NO3- = 8NO + 16H2O

7) Add both equations

24e- + 32H+ + 8NO3- + 12H2O + 3CuS = 3CuSO4 + 24H+ + 24e- + 8NO + 16H2O

8) simplify repeating elements, H+, H2O, and e- typically

8H+ + 8NO3- + 3CuS = 3CuSO4+ 8NO + H2O

if we need HNO3:

8HNO3 + 3Cus = 3CusO4+ 8NO + H2O

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