zincul reactionează cu acidul clorhidric(cuprul nu)
Zn+2HCl=ZnCl2+H2
65g. 2.36,5g........22,4L
x...........y...............4,48L
x=13g Zn
y=14,6 g HCl
ms=md.100/c=1460/30=48,66g
Vs=ms/d=42,24cm3
Cu+4HNO3=Cu(NO3)2+2NO2+2H2O
64g..4moli.......................2.22,4L
x.........y............................5,972g
x=8,53 g Cu
y=0,533 moli HNO3 consumat
Vs=0,533/13=0,041 L solutie de acid azotic