下列离子方程式书写正确的是            (    )     A.向

下列离子方程式书写正确的是            (    )

    A.向CuSO4溶液中投入一小块金属钠:2Na+Cu2+     2Na++ Cu

    B.向溴水中通入SO2气体:SO2+Br2+2H2O= 4H++ SO42-+2Br-

    C.向Ca(C1O2)溶液中通入少量SO2气体:

   Ca2++ +2C1O -十SO2 +H2O    CaSO3↓+2HC1O

    D.向KAl(SO42溶液中滴入Ba(OH)2溶液至SO42-恰好完全沉淀:

        2Al3+ +3SO2-4十3Ba2+ +6OH    3BaSO4 ↓+2Al(OH)3

答案

D

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