13.已知H2 CO3的 _(o1)((H)_(2)C(O)_(3))=4.2times (10)^-7 _(a2)((H)_(2)C(O)_(3))=4.8times (10)^-11, 则 1.0mol/L-|||-NaHCO3溶液pH约为 ()-|||-A.5.6 B.7.0 C.8.3 D.13.0 E.10.85

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