Question

Se amesteca 200 g solutie 35 % cu 600g solutie 15% .Determina concentratia procentuala a solutiei obtinuta dupa amestecare.??

Answer 1

C=md*100/ms
pt 35%
35=md*100/200
35=md/2
md=35*2=70
pt 15%
15=md*100/600
15=md/6
md=15*6=90
C dp amestecare:90-70=20%