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MnO4^- + 8H^+ + 5e^- = Mn^2+ + 4H2O | ·2
2Cl^- → Cl2 + 2e^- | ·5
2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 5Cl2 + 8H2O
b. PbO2 + HCl → PbCl2 + Cl2 + H2O
PbO2 +4H^+ + 2e^- = Pb^2+ + 2H2O | · 1
2Cl^- → Cl2 + 2e^- | ·1
PbO2 + 4HCl → PbCl2 + Cl2 + 2H2O
c. KClO3 + HCl → KCl + Cl2 + ClO2 + H2O
ClO3^- + 2H^+ + e^- → ClO2 + H2O | · 2
2Cl^- → Cl2 + 2e^- | · 1
2KClO3 + 4HCl → 2KCl + Cl2 + 2ClO2 + 2H2O
d. H2O2 + CrCl3 + KOH → K2CrO4 + KCl + H2O
Cr^3+ + 8OH^- → CrO4^2- + 4H2O + 3e^- | ·2
H2O2 + 2e^- → 2OH^- | ·3
3H2O2 + 2CrCl3 + 10KOH → 2K2CrO4 + 6KCl + 8H2O
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