碱 + 非金属氧化物 -------- 盐 + 水
苛性钠暴露在空气中变质：2NaOH + CO2 == Na2CO3 + H2O
苛性钠吸收二氧化硫气体：2NaOH + SO2 == Na2SO3 + H2O
苛性钠吸收三氧化硫气体：2NaOH + SO3 == Na2SO4 + H2O
消石灰放在空气中变质：Ca(OH)2 + CO2 == CaCO3 ↓+ H2O
消石灰吸收二氧化硫：Ca(OH)2 + SO2 == CaSO3 ↓+ H2O
氢氧化钙与碳酸钠：Ca(OH)2 + Na2CO3 == CaCO3↓+ 2NaOH
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