Notez c=concentratie; md= masa dizolvat; ms=masa solutie
c1=20%
c2=25%
ms1=250g
md1=md2=md
md= c*ms1/100 = 20*250/100= 50g zahar
ms2= 100md / c2 = 100*50/25 = 200 g solutie in s2
mapa1 = ms1-md = 250-50 = 200g apa
mapa2 = ms2-md = 150 g apa
Deci trebuie sa se evapore 50 g apa