ms1= 800g
c1= 20%
mapaevap=200g
c= ?
c1= md/ ms1x100
md = c1xms1/100
md = 20x800/100
md=160g
Prin evaporare scade masa solutiei, dar masa de substanta dizolvata ramane aceeasi (md)
ms2= ms1- mapaevap
ms2 =800g - 200g
ms2 = 600g
c2 = md/ms2x100
c2 = 160 / 600x100
c2= 26,66%