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一、放出气体或生成沉淀时的反应先后例1向Na2CO3和Na OH的混合溶液中滴入稀HCl.分析:稀HCl能与Na2CO3反应生成CO2气体,也能与Na OH发生中和反应,但实际反应时,Na OH先和HCl中和,等Na OH被反应完后,Na2CO3才能和HCl反应放出CO2气体,这是因为CO2会被Na OH溶液吸收.归纳:溶液中有碱时,不可能从里面放出CO2、SO2等酸性
First, the release of gas or precipitate when the reaction Example 1 to the mixed solution of Na2CO3 and NaOH dilute HCl. Analysis: dilute HCl can react with Na2CO3 CO2 gas, but also with Na OH neutralization reaction, but In the actual reaction, Na OH is neutralized with HCl first, and after NaOH is reacted, Na2CO3 can react with HCl to emit CO2 gas, because CO2 will be absorbed by NaOH solution. Release from the inside of CO2, SO2 and other acidic