能正确表示下列反应的离子反应方程式为 (  )    A.NH4HCO3 溶于

能正确表示下列反应的离子反应方程式为 ( 

   ANH4HCO3 溶于过量的浓 KOH 溶液中:  NH4++ HCO3-+2OH-= CO32-+ NH3+2 H2O

   B.向明矾溶液中滴加 Ba(OH)2 溶液,恰好使 SO42-沉淀完全:

      2Al3++3SO42-+3Ba2++6OH -=2 Al(OH)3+3BaSO4

   C FeBr2 溶液中通入足量氯气2Fe2++2Br-+2Cl2=2 Fe3++ Br2+4 Cl-

   D醋酸除去水垢2H++CaCO3=Ca2++ CO2+ H2O

答案

A

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