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【简答题】
向含有 Al 3+ , Mg 2+ , Zn 2+ 各 0.02000mol/ L 的混合溶液中加入过量的 NaF 固体使最终游离 F - 的浓度为 0.1mol/L( 忽略体积变化 ) ,然后调节溶液 pH 到 5.0 ,用二甲酚橙做指示剂, 0.02000mol/L 的 EDTA 标准溶液滴定至终点。已知 lgK AlY =16.3 ; lgK ZnY =16.5 ; lg α Y(H) =6.5 ; lgK MgY =8.7 ; Al-F 的 lg β 1 -lg β 6 分别为 6.13, 11.15, 15.00, 17.75, 19.37, 19.84 ; pH=5.0 时, pZnep(xo)=4.8 。 ( 1 )能否准确滴定 Zn 2+ ?( 2 )计算化学计量点时, Zn 2+ 和 MgY 的浓度为多少?( 3 )终点误差是多少?
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