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大家知道,碱性氧化物能跟可溶性酸起反应生成盐和水(如:CuO+2HCl=CuCl_2+H_2O),酸性氧化物能跟可溶性碱起反应生成盐(含氧酸盐)和水(如:SO_3+2KOH=K_2SO_4+H_2O)。那么,碱性氧化物或酸性氧化物能否跟盐反应呢?可能有不少同学认为:金属能跟可溶性盐(盐中金属活动性弱于所用金属)起反应,一般生成另一种盐和另一种金属,那么,氧化物也应该能跟可溶性盐起反应,生成另一种盐和另一种氧化物,于是,在作业或试卷上就出现了这样一类错误的化学方程式:
As we all know, basic oxides react with soluble acids to form salts and water (eg: CuO+2HCl=CuCl2+H2O), and acidic oxides react with soluble bases to form salts (oxygenates) and water (eg, : SO_3+2KOH=K_2SO_4+H_2O). So, can alkaline oxides or acidic oxides react with salt? Some students may think that: metals can react with soluble salts (metal activity in salt is weaker than the metal used) and generally produce another salt and Another kind of metal, then, oxides should also react with soluble salts to produce another salt and another oxide, so that a wrong kind of chemical equation appears on the job or test paper: