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高二氮族元素第三节有介绍HNO３氧化性的演示实验，发生如下反应：Cu＋４HNO３（浓）＝Cu（NO３）２＋２NO２↑＋２H２O３Cu＋８HNO３（稀）＝３Cu（NO３）２＋２NO↑＋４H２O实验后有学生提出：浓HNO３与稀HNO３到底哪一个氧化性强？由于教材没有明确说明，因而学生仅从HNO３?
In the third quarter of high dinitrogen elements, the demonstration experiment of HNO3 oxidation was introduced. The following reactions occurred: Cu+4HNO3(concentration)=Cu(NO3)2+2NO2↑+2H2O3Cu+8HNO3(lean)=3Cu(NO3)2+2NO↑+4H2O Which of HNO3 and dilute HNO3 is highly oxidizing? Since the teaching materials do not have a clear explanation, the students only come from HNO3?