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SO2+Ca(OH)2=CaSO3↓+H2O 有點類似複分解反應
少量SO2+Ca(OH)2=CaSO3(沉澱)+H2O 過量2SO2+Ca(OH)2=Ca(HSO3)2 過量就是少量生成煩人CaSO3(沉澱)繼續和SO2反應生成Ca(HSO3)2 即CaSO3+SO2+H2O=Ca(HSO3)2
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