Question

Daca 4,2 kg sol sare de c=10% prin ecaporare rezulta 100 g(1 kg ).care este solutia ramasa dupa evaporare?

Answer 1

ms1= 4,2kg

c=10%

md1?

c1=md1x100/ms1---> md1=4,2x10/100kg=0,42kgsare

ms2=1kg

md2=md1=0,42kg

c2= md2x100/ms2= 0,42x100/1=42%.