题目内容
（请给出正确答案）
将氧化还原反应Ni+2Ag+====2Ag+Ni2+设计为一个原电池，则电池的负极为______，正极为______，原电池符号为______。若
(Ni2+/Ni)=-0.25V，
(Ag+/Ag)=0.80V，原电池的电动势
为______，
为______，该反应的平衡常数为______。
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