在100mL含等物质的量HBr和H2SO3的溶液里通入0.01molCl2,有一半Br-变为Br2

在100mL含等物质的量HBr和H2SO3的溶液里通入0.01molCl2,有一半Br-变为Br2。原溶液中HBr和H2SO3的浓度都等于                              (    )

    A.0.0075mol/L    B.0.0018mol/L    C.0.075mol/L    D.0.08mol/L

答案

D


解析:

解此题时首先要明确:H2SO3的还原性比Br-强,氯气先氧化H2SO3,再氧化Br-,设原溶液中HBr和H2SO3的浓度都为x,则:x=0.08mol/L。

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