Răspuns:
solutia1
ms1=100g
c1=10%
md1=ms1xc1/100= 10g
solutia2
c2=15% cum c2>c1, solutia se concentreaza prin evaporarea apei
md2=md1=10g
ms2= md2x100/c2=66,7g
m,apa evaporata= ms1-ms2=33,3g
solutia3
c3=5% cum c3<c1, solutia 1 se dilueaza prin adaugare de apa
md3=md1=10g
ms3= 10x100/5g=200g
m,apa adaugata=m3-m1= 100g
Explicație: