今有0.1mol/l的na2so4溶液300ml,0.1mol/l的kal(so4)2溶液200ml,0.1mol/l的Al2(so4)3溶液100ml

问题描述:

今有0.1mol/l的na2so4溶液300ml,0.1mol/l的kal(so4)2溶液200ml,0.1mol/l的Al2(so4)3溶液100ml
,加入等浓度的Bacl2溶液,恰好完全沉淀.消耗Bacl2的体积比为
A.1:1:1 B.3:2:2 C.3:4:6 D.1:1:3

na2so4溶液 0.03molSO42-
,0.1mol/l的kal(so4)2溶液 0.04molSO42-
0.1mol/l的Al2(so4)3 0.03molSO42-
应该是3:4:3对啊,我算的也是这个,怎么选啊没法选 答案错了