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4Chemistry 30
Unit 6: Redox Reactions and Electrochemistry
Practice Set 3: Balancing Redox Reactions
1. Balance the following redox reactions using the oxidation number method.
→ SnCl
a. SnCl
+ HgCl
+ HgCl
2
2
4
Total
initial
final
change
Coefficient
-
e
→
×
Sn
+2
+4
2
1
=
2
→
×
Hg
+2
+1
1
2
=
2
Place a “1” in front of compounds containing Sn, and a “2” in front of compounds with Hg:
→ 1 SnCl
1 SnCl
+ 2 HgCl
+ 2 HgCl
Answer:
2
2
4
Double check to make sure all other atoms in the equation are balanced.
S → NO + S + H
b. HNO
+ H
O
3
2
2
Total
initial
final
change
Coefficient
-
e
→
×
N
+5
+2
3
2
=
6
→
×
S
-2
0
2
3
=
6
Place a “2” in front of compounds containing N, and a “3” in front of compounds with S. Then balance
for hydrogen and oxygen.
S → 2 NO + 3 S + 4 H
2 HNO
+ 3 H
O
Answer:
3
2
2
S → NaCl + H
c. NaClO + H
SO
2
2
4
Total
initial
final
change
Coefficient
-
e
→
×
Cl
+1
-1
2
4
=
8
S
-2
→
+6
8
×
=
8
1
S → 4 NaCl + 1 H
4 NaClO + 1 H
SO
Answer:
2
2
4
Unit 6: Redox & Electrochemistry
Practice Set 3
Page 1 of 4
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