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A.H2SO4与Ba(OH)2溶液反应: Ba2++2OH-+2H++SO42-→ BaSO4↓+2H2O B.Ca(HCO3)2与过量Ca(OH)2溶液反应: Ca2++HCO3-+2OH-→CaCO3↓+ CO32-+2H2O C.Na2CO3溶液中通入少量CO2: CO32-+ CO2+ H2O→2HCO3- D.CH3COOH溶液与NaOH溶液反应: H++ OH-→H2O
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