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As2S3 + 20H2O → 2AsO4^3- + 3SO4^2- + 40H^+ + 28e^- | ·3
NO3^- + 4H^+ + 3e^- → NO + 2H2O | ·28
3As2S3 + 28HNO3 + 4H2O → 6H3AsO4 + 9H2SO4 + 28NO
KI + KMnO4 + H2SO4 → I2 + MnSO4 + K2SO4 + H2O
2I^- → I2 + 2e^- | · 5
MnO4^- + 8H^+ + 5e^- → Mn^2+ + 4H2O | · 2
10KI + 2KMnO4 + 8H2SO4 → 5I2 + 2MnSO4 + 6K2SO4 + 8H2O
proszę :)