Cu+4HNO3(浓)=Cu(NO3)2+2NO2+2H2O
3Cu+8HNO3(稀)=3Cu(NO3)2+2NO+4H2O
Al+4HNO3(稀)=Al(NO3)3+NO+2H2O
铁、铝和冷的浓硝酸反应钝化.如果加热会反应如下:
少量Fe,Fe+6HNO3(浓)=Fe(NO3)3+3NO2+3H2O
大量Fe,Fe+4HNO3(浓)=Fe(NO3)2+2NO2+2H2O
Al+6HNO3(浓)=Al(NO3)3+3NO2+3H2O
少量Fe,Fe+4HNO3(稀)=Fe(NO3)3+2NO+2H2O
大量Fe,3Fe+8HNO3(稀)=3Fe(NO3)2+2NO+4H2O