二氧化硫+酸化重鉻酸鉀的方程式?

SO2(aq) + 2H2O --> SO4^2- +2H^+ 2e-
Cr2O7^2- +14H^+ +6e- -->2Cr^3+ +7H2O

3SO2(aq) + Cr2O7^2- +14H^+ -> 3SO4^2- +6H^+ + 2Cr^3+ +H2O

由橙變綠

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