The issue of silver chloride precipitation
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During the process of dissolving silver, an excessive amount of concentrated nitric acid (65%) was used along with a long heating time, which caused the silver nitrate solution to turn brownish-red. After adding NaCl to form silver chloride and allowing it to settle for 2 days, the result was still not satisfactory; moreover, the only way to proceed was by filtering out the liquid. Could someone help solve this problem and explain the reasons?
It might be caused by nitrogen oxides dissolving in this solution; that’s something to consider.