Oxides of non-metals possess acidic properties, and if soluble, they react with water giving the corresponding acids: SO3 + H2O –> H2SO4 P2O5 + 3H2O –> 2H3PO4 CO2 + H2O ⇄ H2CO3 2NO2 + H2O –> HNO2 + HNO3 Concerning the insoluble oxides, they do not react with water at all: SiO2 + H2O ⇏
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