将20mL0.5mol/L AL2(SO4)3溶液加水稀释到500mL,稀释后溶液中SO4根浓度为( )

问题描述:

将20mL0.5mol/L AL2(SO4)3溶液加水稀释到500mL,稀释后溶液中SO4根浓度为( )

解析:
20mL0.5mol/L AL2(SO4)3溶液 AL2(SO4)3共0.01mol,则硫酸根的物质的量为0.03mol
加水稀释到500mL后溶液中SO4根浓度=0.03/0.5=0.06mol/L