balancing redox reactions. steps: 1.assign oxidation numbers 2.write half reactions 3.balance...
TRANSCRIPT
Balancing Redox Balancing Redox ReactionsReactions
StepsSteps::
1. Assign oxidation numbers
2. Write half reactions
3. Balance electrons to determine coefficients needed
2HgO O2 + 2Hg+2 -2 0 0
Hg+2 + 2e- Hg0 Reduction
Problem 1:
O-2 O0 + 2e- Oxidation
2KClO3 2KCl + 3O2
+1 +5 -2 +1 -1 0
6e- + Cl+5 Cl-1 Reduction
Problem 2:
3(O-2 O0 + 2e-) Oxidation
2HCl + Zn ZnCl2 + H2
+1 -1 0 +2 -1 0
2e- + 2H+1 H20 Reduction
Problem 3:
Zn0 Zn+2 + 2e- Oxidation
2Ag NO3 + Cu Cu(NO3)2 + 2Ag+1 +5 -2 0 +2 +5 -2 0
2e- + 2Ag+1 2Ag0 Reduction
Problem 4:
Cu0 Cu+2 + 2e- Oxidation
4NH3 + 3O2 2N2 + 6H2O -3 +1 0 0 +1 -2
12e- + 3O20 6O-2 Reduction
Problem 5:
4N-3 2N20 + 12e- Oxidation
3Mg + 2Al(NO3)3 2Al + 3Mg(NO3)2
0 +3 +5 -2 0 +2 +5 -2
6e- + 2Al+3 2Al0 Reduction
Problem 6:
3Mg0 3Mg+2 + 6e- Oxidation
3Ca + 2Al3+ 3Ca2+ + 2Al 0 +3 +2 0
6e- + 2Al+3 2Al0 Reduction
Problem 6:
3Ca0 3Ca+2 + 6e- Oxidation
2Fe3+ + Sn2+ 2Fe2+ + Sn4+
2e- + 2Fe+3 2Fe+2 Reduction
Problem 7:
Sn+2 Sn+4 + 2e- Oxidation
2HNO3 + 3MnCl2 + 6HCl 2NO + 3MnCl4 + 4H20+1 +5 -2 +2 -1 +1 -1 +2 -2 +4 -1 +1 -2
6e- + 2N+5 2N+2 Reduction
Problem 8:
3Mn+2 3Mn+4 + 6e- Oxidation
K2(Cr2O7) + 14HCl 3Cl2 + 7H2O + 2CrCl3 + 2KCl+1 +6 -2 +1 -1 0 +1 -2 +3 -1 +1 -1
6e- + Cr2+6 2Cr+3 Reduction
Problem 9:
6Cl-1 3Cl20 + 6e- Oxidation