已知在 1mol·L -1 的 HCl 溶液中, E Θ Fe 3+ /Fe 2+ =0.68V , E Θ Sn 4+ /Sn 2+ =0.14V 。讲 20mL 0.10 mol·L -1 Fe 3+ 的 HCl 溶液与 40mL 0.050 mol·L -1 SnCl 2 溶液相混合,平衡时体系的电势为
A.
0.14V
B.
0.50V
C.
0.68V
D.
0.32V
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