亚硫酸、碳酸、亚硫酸氢根、碳酸氢根 酸性强弱

2025-03-16 00:39:28
推荐回答(3个)
回答1:

H2SO3>H2CO3>HSO3->HCO3-
CO32-+SO2+H2O=HCO3-+HSO3-.当SO2和Na2CO3以1:1反应时就是这个方程.
强酸 弱酸
再通入SO2则:
HCO3-+SO2+H2O=CO2+H2O+HSO3-.
强酸 弱酸
相加後得到
CO32-+2SO2+H2O=CO2+2HSO3-.当SO2和Na2CO3以2:1反应时就是这个方程.

NaHCO3和SO2只发生上述第二个反应,虽然两边都产生水可以消掉但是本质还是要气体与水成酸之後才能进行强酸制弱酸,因此需要水参加.
注意,溶液中酸性气体发生强酸制弱酸则要有水参加,而方程式左右两边的H2O可以消掉却是另外一回事.

回答2:

酸性比较
H2SO3>H2CO3>HSO3->HCO3-
当SO2少量的时候
Na2CO3+SO2=Na2SO3+CO2

当SO2过量的时候
SO2会和Na2SO3继续反应:
Na2SO3+SO2+H2O=2NaHSO3

反应式需要有H2O参与反应的

满意请采纳
谢谢

回答3:

hco3-+so2=hso3-+co2↑
co2的溶解度比so2的要小,所以会生成气体。所以可以反映。
理解成强酸制弱酸
也没问题
方程就得换个写法
so2先和水反应生成+h2so3
hco3-+h2so3=hso3-+h2co3
h2so3的酸性比h2co3酸性强,强酸制弱酸生成h2co3,h2co3不稳定分解成co2

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