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【简答题】
在PH=10．0的氨性缓冲溶液中，以铬黑T(EBT)为指示剂，以2．0×10-3mol.dm-3EDTA滴定2．0×1 0-2mol.dm-3 Ca2+，问终点误差为多少?若在相同条件下滴定的是2．0×10-2mol.dm-3Mg2+，其终点误差又为多少?Kfθ(CaY)比Kfθ(MgY)大，为什么滴定Ca2+比滴定Mg2+的终点误差反而要大?(lgKfθ(CaY)=10．7；lgKfθ(MgY)=8．7；pH=10时，lgα(Y(H))=0．45；EBT的pKa1θ=6．3，pKa2θ=11．6，lgKfθ(Ca—EBT)=5．4，lgKfθ(Mg—EBT)=7．0)
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