1　实验的设想先将硝酸铜溶液蒸干 ,再加热硝酸铜 ,使其受热分解 ,生成的氮的氧化物用氢氧化钠溶液吸收 ,生成的氧化铜可以还原为铜盐 ,生成的铜又可以与稀硝酸反应生成铜 ,并实现了铜的循环实验。2　改进后的实验2 1　实验仪器 :试管两支、烧杯、锥形瓶、漏斗、酒精灯、铁架 1 The idea of ​​the experiment is to first evaporate the copper nitrate solution and then heat the copper nitrate to decompose it by heat. The resulting nitrogen oxides are absorbed by the sodium hydroxide solution, and the resulting copper oxide can be reduced to copper salts. The resulting copper can Reaction with dilute nitric acid to produce copper, and to achieve a copper cycle experiment. 2 Improved experiment 2 1 Experimental apparatus: two test tubes, beaker, conical flask, funnel, alcohol lamp, iron frame