二氧化硫
二氧化硫（式書SO2），硫之氧化物也。室溫常壓之下，其形為氣，加之以壓，或以寒，其形遂為液。二氧化硫者，大氣污染物，性有毒。
製
二氧化硫者，硫之燃燒得之。
- S + O2 = SO2
並亞硫酸鹽與強酸者，亦可得之。
- SO32− + 2 H+ = SO2 + H2O
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