我用溶硝酸溶解铜.加铁还原、再用硝酸除去多余的铁.得到的铜为什么过两天就会变黑我该怎么处理还有就是我想溶解一公斤铜线,《细铜线》该加多少硝酸.是稀硝酸号还是浓硝酸号
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![我用溶硝酸溶解铜.加铁还原、再用硝酸除去多余的铁.得到的铜为什么过两天就会变黑我该怎么处理还有就是我想溶解一公斤铜线,《细铜线》该加多少硝酸.是稀硝酸号还是浓硝酸号](/uploads/image/z/8226765-45-5.jpg?t=%E6%88%91%E7%94%A8%E6%BA%B6%E7%A1%9D%E9%85%B8%E6%BA%B6%E8%A7%A3%E9%93%9C.%E5%8A%A0%E9%93%81%E8%BF%98%E5%8E%9F%E3%80%81%E5%86%8D%E7%94%A8%E7%A1%9D%E9%85%B8%E9%99%A4%E5%8E%BB%E5%A4%9A%E4%BD%99%E7%9A%84%E9%93%81.%E5%BE%97%E5%88%B0%E7%9A%84%E9%93%9C%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%87%E4%B8%A4%E5%A4%A9%E5%B0%B1%E4%BC%9A%E5%8F%98%E9%BB%91%E6%88%91%E8%AF%A5%E6%80%8E%E4%B9%88%E5%A4%84%E7%90%86%E8%BF%98%E6%9C%89%E5%B0%B1%E6%98%AF%E6%88%91%E6%83%B3%E6%BA%B6%E8%A7%A3%E4%B8%80%E5%85%AC%E6%96%A4%E9%93%9C%E7%BA%BF%2C%E3%80%8A%E7%BB%86%E9%93%9C%E7%BA%BF%E3%80%8B%E8%AF%A5%E5%8A%A0%E5%A4%9A%E5%B0%91%E7%A1%9D%E9%85%B8.%E6%98%AF%E7%A8%80%E7%A1%9D%E9%85%B8%E5%8F%B7%E8%BF%98%E6%98%AF%E6%B5%93%E7%A1%9D%E9%85%B8%E5%8F%B7)
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