向60mLNa2SO4溶液中加入BaCl2溶液,有关数据见下表: 实验编号12345 BaCl

60mLNa2SO4溶液中加入BaCl2溶液,有关数据见下表:

实验编号

1

2

3

4

5

BaCl2溶液体积/mL

0

20

40

100

120

沉淀质量/g

0

0.233

m

0.699

0.699

下列有关说法正确的是(   

  A.混合前,Na2SO4溶液的物质的量浓度为0.05mol/L

  B.混合前,BaCl2溶液的物质的量浓度为0.10mol/L

  C.3号实验中沉淀的质量m0.398g

  D.完全沉淀60mLNa2SO4溶液消耗BaCl2溶液的体积为80mL

答案

A

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