盐经常受光照还能食用吗？ 盐的正确保存方法是什么?
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1\u3001\u5c06\u98df\u76d0\u5bc6\u5c01\u4fdd\u5b58\u3002
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2\u3001\u7528\u6709\u8272\u5bb9\u5668\u4fdd\u5b58\u3002
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主要是银盐见光分解，生成银颗粒而变暗。
大多数的银盐见光分解，生成银颗粒，银颗粒是黑色的，所以银盐容易在光照条件下变暗。
化学原理：2AgCl=光=2Ag+Cl2(^)
2AgNO3=光=2Ag+2NO2(^)+O2(^)
2Ag2CO3=光=4Ag+2CO2(^)+O2(^)
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