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【简答题】
10 mol/L Na 2 HPO 4 溶液的近似 pH 为 ( ) 0.10 mol/L NaH 2 PO 4 溶液的近似 pH 为 ( ) ( 已知 H 3 PO 4 的 p K a1 = 2.12 , p K a2 = 7.20 , p K a3 = 12.36 )
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