问答题

准确量取30.00mL弱酸HA，加水稀释至10.00mL。在下列电池中：
（-）Pt,H2（1atm）|HA‖SCE(+)
以0.1000 mol/LNaOH溶液滴定弱酸HA溶液。当酸HA被中和一半时，电池电动势为0.504V；化学计量点时，电池电动势为0.729V。
计算： ①弱酸HA的Ka?
②原弱酸HA的浓度?（φSCE=0.242V）

A.00mL弱酸HA，加水稀释至10.00mL。在下列电池中：
B.1000
C.504V；化学计量点时，电池电动势为0.729V。
计算： ①弱酸HA的Ka?
②原弱酸HA的浓度?（φSCE=0.242V）

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