Răspuns :

c=(md*100)/ms
20=(md*100)/50
20=md*2
md=20/2=10g
ms=md+mH2O=> mH2O=ms-md=50-10=40g H2O (pentru solutia de 20%)

30=(md*100)/50
30=md*2
md=30/2= 15g
mH2O= 50-15= 35g (pentru solutia de 30%)

ID Alte intrebari