银氨溶液配制过程中的沉淀现象探析  

Analysis of Precipitation in Preparation of Tollens’ Reagent

作　　者：程瑶琴 熊言林[1] 信欣 CHENG Yao-Qin;XIONG Yan-Lin;XIN Xin(College of Chemistry and Materials Science,Anhui Normal University,Wuhu 241000,China)

机构地区：[1]安徽师范大学化学与材料科学学院

出　　处：《化学教育（中英文）》2019年第23期75-76,共2页Chinese Journal of Chemical Education

摘　　要：通过一系列实验发现,新制的氨水与硝酸银溶液反应只能看到暗棕色的氧化银沉淀生成与溶解的实验现象;氨水与空气接触时间较长时,部分氨水吸收了空气中的二氧化碳生成碳酸铵,这样的氨水与硝酸银溶液反应,便有白色的碳酸银沉淀生成。Through a series of experiments, this paper obtained that: the formation and dissolution of dark brown silver oxide precipitate could only be seen in the reaction of newly prepared ammonia water and silver nitrate solution;when ammonia water was exposed to air for a long time, part of the ammonia water absorbed carbon dioxide from the air to produce ammonium carbonate, then the ammonia water reacted with silver nitrate solution, white silver carbonate precipitates generated.

关 键 词：银氨溶液 沉淀颜色 沉淀成分 

分 类 号：G63[文化科学—教育学]