在0.5mol/L的H2SO4溶液中,Sn4++2e=Sn2+的条件电势为0.09V。若溶液中四价锡和二价锡的分析浓度分别为0.1和1×10-11mol/L时,溶液的电势为( ) V
A.
0.09
B.
-0.21
C.
0.39
D.
-0.50
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