Question

Din 120 ml alcool de 99.5%, câtă
apa trebuie sa adaug sa pot obtine alcool de 70%

Answer 1

V1=120 ml
C1=99,5 %
C2=70 %
m H2Oadaug=?
C1=V1/Vs1*100
Vs1=V1*100/C1=120*100/99,5= 120.60ml
Vs2=V1*100/C2=120*100/70 =171,42 ml
VH2O=V2-V1=171,42-120,60=50,82ml