Problem 5: Write the redox reaction for the following chemicals and label the electron donor, electron...
Problem 5: Write the redox reaction for the following chemicals and label the electron donor, electron acceptor, oxidation reaction, reduction reaction, oxidant and reductant, oxidized compound and reduced compound: (12 points)
a. O2/H2O and SO42-/HS-
b. NO3-/N2 and CO2/CH4
c. SO42-/HS- and
CO2/CH4
Homework Answers
a. The given chemicals are
O2 / H2O and SO42-/HS-
For O2 
H2O ; In this oxidation state of 'O' changes from 0 to
-2 so it is reduction.
Reduction reaction; 4e-+
O2
2O2-
Also For SO42-
HS- ; In this oxidation state of 'S' changes from +6 to
-2 so it is also a reduction
Reduction reaction; 8e- +
S6+
S2-
but no oxidation transformation is given in problem,so from these chemicals redox reaction is not possible in the given direction.
and all other terms are related to Redox reactions so here these are not defined.
b.The given chemicals are
NO3-/N2 and CO2/CH4
For NO3-
N2 ; In this oxidation state of 'N' changes from +5 to 0
so it is reduction.
Reduction reaction;
10e-+ 2N5+
N2
Also For CO2
CH4 ; In this oxidation state of 'C' changes from +4 to
-4 so it is also a reduction
Reduction reaction; 8e-+
C4+
C4-
but no oxidation transformation is given in problem,so from these chemicals redox reaction is not possible in the given direction.
and all other terms are related to Redox reactions so here these are not defined
c. The given chemicals are
SO42-/HS- and CO2/CH4
For SO42-
HS-;In this oxidation state of 'S' changes from +6 to -2
so it is also a reduction
Reduction reaction; 8e- +
S6+
S2-
Also For CO2
CH4 ; In this oxidation state of 'C' changes from +4 to
-4 so it is also a reduction
Reduction reaction; 8e-+
C4+
C4-
but no oxidation transformation is given in problem,so from these chemicals redox reaction is not possible in the given direction.
and all other terms are related to Redox reactions so here these are not defined
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