问题标题:
某Al2(SO4)3溶液VmL中含agAl3+,取出V4mL溶液稀释成4VmL后,SO42-的物质的量浓度为()A.125/54Vmol•L-1B.125a/36Vmol•L-1C.125a/18Vmol•L-1D.125a/Vmol•L-1
问题描述:
某Al2(SO4)3溶液V mL中含a g Al3+,取出
A.125/54V mol•L-1
B.125a/36V mol•L-1
C.125a/18V mol•L-1
D.125a/V mol•L-1
谭秋林回答:
agAl3+的物质的量为ag27g/mol=a27mol,故V4mL溶液中Al3+的物质的量为a27mol×V4mLVmL=a108mol,根据电荷守恒可知2n(SO42-)=3n(Al3+),故V4mL溶液中SO42-的物质的量为a108mol×32=a72mol,取V4mL溶液稀释到4V&nb...
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