问题标题:
VmLAl2(SO4)3溶液中,含有Al3+ag,取V/2mL溶液稀释到3VmL,则稀释后溶液中SO42-的浓度是()A.250a/27Vmol/LB.250a/9Vmol/LC.500a/9Vmol/LD.125a/9Vmol/L那个……下角标和上角标我打不出凑合看吧……
问题描述:
VmLAl2(SO4)3溶液中,含有Al3+ag,取V/2mL溶液稀释到3VmL,则稀释后溶液中SO42-的浓度是()
A.250a/27Vmol/LB.250a/9Vmol/LC.500a/9Vmol/LD.125a/9Vmol/L
那个……下角标和上角标我打不出凑合看吧……
李玉江回答:
原溶液中Al3+的物质的量为:n(Al3+)=ag/27g/mol=a/27mol所以原溶液中Al2(SO4)3的物质的量为n【Al2(SO4)3】=a/54mol原溶液中Al2(SO4)3的量浓度为:c【Al2(SO4)3】=n【Al2(SO4)3】/V=a/54/V=1000a/54Vmol/L=500...
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