NaH 2 PO 4 - Na 2 HPO 4 混合试液中各组分含量的测定,能用 NaOH 溶液测定其中 NaH 2 PO 4 的含量,是因为 NaH 2 PO 4 的基本满足 Ka 2 C ≥10 -8 , Ka 3 C ≤10 -8 且 Ka 2 /Ka 3 > 5 。( ) [ 已知 H 3 PO 4 的 Ka 1 =7.6×10 -3 , Ka 2 =6.3×10 -8 , Ka 3 =4.4×10 -13 ]
A.
正确
B.
错误
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