有电池Zn(s)|Zn2+(a1)‖Cu2+(a2)}Cu(s),该电池的电动势ξ:
A.当a2=常数时,a1增加,E也增加
B.当a1=常数时,a2增加,E减小
C.当a2增加,a1减小时,E增加
D.当a2增加,a1减小时,E减小
正确答案是C
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