SO2和水反应生成H2SO3.反应在溶液中进行,所以有H+,H+和NO3-把它氧化成硫酸,SO42-再和BA2+形成沉淀.
即3SO2 + 2NO3- + 3Ba2+ + 2H2O = 3BaSO4↓ + 2NO + 4H+
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