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15问答网 > 银器皿日久表面逐渐变黑色，这是由于生成硫化银.有人设计用原电池原理加以除去，其处理方法为：将一定浓度

银器皿日久表面逐渐变黑色，这是由于生成硫化银.有人设计用原电池原理加以除去，其处理方法为：将一定浓度

2025-04-06 05:29:38

推荐回答（2个）

回答1：

1、增加水的导电性
2、2Al-6e=2Al3+
3Ag2S+6e=6Ag+3S2-
3、2Al3+ + 3S2-+6H2O=2Al(OH)3+3H2S
3Ag2S + 2Al + 6H2O == 2Al(OH)3+3H2S+6Ag
4、想不明白

回答2：

负极：2Al-6e－=Al3+
正极：3Ag2S+6e－==4Ag+3S2-
原电池总反应方程式：3Ag2S+2Al+6H2O==6Ag+2Al(OH)3↓+3H2S↑
溶液中发生的反应为2Al3++3S2-+6H2O=2Al(OH)3↓+3H2S↑
加入小苏打是为了减少H2S气体的排放，减少大气污染。
Al3++3HCO3-=Al(OH)3↓+3CO2↑

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